There are some dishes that just feel like coming home, and this old-fashioned broccoli cheese casserole with Ritz topping is one of them. I still remember the first time I pulled a bubbling dish of this out of the oven; the golden, buttery crackers had crisped up into a perfect crown, and the creamy, cheesy filling underneath was speckled with vibrant green florets. My husband, who’s usually picky, asked for seconds before he’d even finished his first helping!

Recipe Overview

• Prep Time: 20 minutes
• Cook Time: 30 minutes
• Total Time: 50 minutes
• Servings: 6 to 8
• Difficulty: Easy

Why You’ll Love This Old-Fashioned Broccoli Cheese Casserole with Ritz Topping

• Remarkably Simple Ingredients: You likely already have most of these pantry staples on hand, from tinned soup to sharp cheddar. There’s no fussing with complicated roux or hard-to-find items.
• Reliably Creamy Every Time: The combination of a rich cream of mushroom sauce, tangy sour cream, and plenty of melted cheese creates a luscious, never-grainy sauce that clings beautifully to every piece of broccoli.
• The Iconic Buttery Crunch: That signature Ritz cracker topping isn’t just for show. It bakes into a gloriously golden, salty, and buttery crust that provides the perfect textural contrast to the soft, tender casserole beneath.
• Make-Ahead Magic: This is the kind of dish that actually improves with a little rest. You can assemble it entirely the day before, store it in the fridge, and simply pop it in the oven when you’re ready to bake.
• A True Family Staple: It’s one of those rare recipes that appeals to both adults and children. The familiar, gentle flavour of broccoli and cheese is comforting without being bland, and the crunchy top is always a hit.

Old-Fashioned Broccoli Cheese Casserole with Ritz Topping

15 min prep  ·  30 min cook  ·  6 servings

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Ingredients You’ll Need

• 900g fresh broccoli florets (about 2 large heads)
• 1 tablespoon unsalted butter, plus extra for the dish
• 1 medium yellow onion, finely chopped (about 150g)
• 2 cloves garlic, minced
• 1 x 400g tin condensed cream of mushroom soup
• 200ml full-fat sour cream
• 1 teaspoon Dijon mustard
• ½ teaspoon freshly ground black pepper
• ¼ teaspoon fine sea salt
• 300g mature cheddar cheese, grated (plus extra for the top)
• 50g unsalted butter, melted (for the topping)
• 70g Ritz crackers (about 1 sleeve), finely crushed

Tip: For the best texture, try to cut your broccoli florets into uniform, bite-sized pieces. This ensures they all cook at the same rate, leaving no sad, crunchy stalks in an otherwise tender casserole.

How to Make Old-Fashioned Broccoli Cheese Casserole with Ritz Topping

1. Preheat and Prepare the Broccoli: Set your oven to 180°C (350°F). Grease a 23x33cm baking dish with a little butter. Bring a large pot of salted water to a rolling boil. Add the broccoli florets and blanch for exactly 2 minutes. You’re looking for them to turn a bright, vivid green and become just tender when pierced with a knife, but they should still have a slight resistance. Drain immediately into a colander and rinse with cold water to stop the cooking process. Set aside.
2. Sweat the Aromatics: In a large frying pan, melt 1 tablespoon of butter over a medium heat. Add the finely chopped onion and cook for about 5 minutes, stirring occasionally, until it becomes translucent and soft, and you can smell its sweet, savoury aroma. Add the minced garlic and cook for a further 30 seconds until fragrant.
3. Build the Creamy Sauce: In a large mixing bowl, combine the tin of condensed mushroom soup, the sour cream, Dijon mustard, black pepper, and salt. Whisk everything together until it is completely smooth and a uniform pale beige in colour. Fold in the sautéed onion and garlic, then gently stir in 250g of the grated cheddar cheese until it is evenly distributed.
4. Combine and Assemble: Add the blanched and drained broccoli florets to the bowl with the sauce. Using a large rubber spatula, fold everything together gently but thoroughly, ensuring every single floret is coated in that luscious, cheesy sauce. The mixture should look thick and creamy, with bright green and white flecks throughout.
5. Transfer to the Dish: Spoon the broccoli mixture into the prepared baking dish and spread it into an even layer. Sprinkle the remaining 50g of grated cheddar cheese over the top, creating a first, melty blanket.
6. Make the Ritz Topping: In a small bowl, combine the finely crushed Ritz crackers with the 50g of melted butter. Stir with a fork until every crumb is moistened and the mixture resembles wet sand. Sprinkle this buttery crumb mixture evenly over the cheese layer.
7. Bake to Golden Perfection: Place the dish in the preheated oven, uncovered, and bake for 25 to 30 minutes. You’ll know it’s ready when you can see the sauce bubbling up around the edges of the dish, the whole casserole is steaming hot, and the Ritz topping has turned a deep, golden brown. The kitchen will smell gloriously of toasted butter and melted cheese.
8. The Crucial Rest: Remove the casserole from the oven and let it sit on the counter for at least 10 minutes before serving. This rest allows the sauce to settle and thicken slightly, meaning your servings will hold their shape on the plate rather than turning into a soupy puddle.

Tips From My Kitchen

• Don’t Overcook the Broccoli During Blanching: The 2-minute blanching time is non-negotiable. You want the broccoli to be just tender. It will continue to cook in the oven, and if you blanch it until it’s fully soft, you’ll end up with a mushy, flavourless casserole. The broccoli should still have a pleasant bite and a vibrant colour when you add it to the dish.
• Grate Your Own Cheese: I cannot stress this enough. Pre-shredded cheese is coated in anti-caking agents like cellulose and potato starch, which prevent it from melting smoothly. For a creamy, luscious sauce that doesn’t separate or become grainy, always buy a block of mature cheddar and grate it yourself. The difference in texture is night and day.
• Crush the Crackers Just Right: You want a mix of fine crumbs and slightly larger, pea-sized pieces. If you crush them into dust, you lose that lovely crunchy texture. I place the crackers in a zip-top bag and use a rolling pin to give them a few good whacks, leaving some texture behind. You should still be able to see small, distinct cracker pieces in the topping.
• Toast the Topping if Needed: Every oven runs a little differently. If your casserole is hot and bubbling but the Ritz topping still looks pale at the 25-minute mark, switch your oven to the grill (broiler) setting for the last 1-2 minutes. Watch it very carefully, as the crackers can burn in seconds. You’re looking for a deep, golden-brown hue.
• Let it Rest for the Perfect Slice: I know it’s tempting to dive in right away, but that 10-minute rest is essential. It allows the steam to settle and the sauce to reabsorb into the broccoli, thickening the casserole. If you serve it immediately, you’ll get a runny, watery sauce. After resting, you’ll get neat, beautiful squares that hold together perfectly.
• Use Full-Fat Dairy for Best Results: This is a treat, so don’t skimp on the fat. Using full-fat sour cream and a good quality, full-fat cream of mushroom soup is what gives this casserole its signature velvety richness. Low-fat alternatives often contain more water and thickeners, which can lead to a thin, separated sauce.

Common Mistakes to Avoid

• Overcrowding the pan: If you pile all the broccoli into the boiling water at once, the water temperature drops drastically and the broccoli will steam rather than blanch, leading to uneven cooking and a dull green colour. Work in batches if necessary, ensuring the water returns to a full boil before adding the next batch.
• Wrong temperature: Baking at too high a temperature can cause the Ritz topping to burn before the centre is hot, while a low temperature might make the sauce greasy and the broccoli mushy. Stick to 180°C (350°F). This moderate heat allows the casserole to heat through evenly and the topping to crisp up perfectly in the same timeframe.
• Skipping the rest time: This is the most common mistake I see. The sauce is at its most liquid state when it comes out of the oven. As it cools for those 10 minutes, the starches in the soup and the cheese proteins firm up, creating a stable, scoopable casserole. Skipping this step guarantees a messy plate.

Delicious Variations to Try

• Spicy Version: For a gentle kick, add ½ teaspoon of red pepper flakes to the onion while it’s sautéing. You can also swap the Dijon mustard for a teaspoon of hot English mustard, or use a mature cheddar that has a bit of a peppery finish, like a Red Leicester or a Double Gloucester.
• Vegetarian/Vegan Option: This recipe is already vegetarian if you use a vegetarian-friendly cheddar and cream of mushroom soup (check labels for animal rennet). For a vegan version, use a high-quality block of vegan cheddar that melts well, a plant-based sour cream, and a vegan butter alternative. The Ritz crackers are typically vegan, but do double-check the packet.
• Different Protein: To turn this into a more substantial main dish, fold in 300g of shredded, cooked chicken or turkey breast after you’ve combined the sauce and broccoli. The mild flavour of the poultry works beautifully with the creamy cheese sauce. For another hearty option, you might enjoy this alongside a Creamy Cajun Chicken Pasta for a true feast.

What to Serve With Old-Fashioned Broccoli Cheese Casserole with Ritz Topping

• A simple, crisp green salad with a sharp vinaigrette to cut through the richness.
• Roasted or grilled chicken, turkey, or a piece of Honey Glazed Baked Salmon for a balanced meal.
• Fluffy white rice or buttery mashed potatoes to soak up any extra sauce.
• Some crusty bread or dinner rolls for mopping up the last bits from the plate.

Frequently Asked Questions

Old-Fashioned Broccoli Cheese Casserole with Ritz Topping

A classic, comforting casserole featuring tender blanched broccoli florets enveloped in a rich, creamy sauce made with condensed mushroom soup, sour cream, and mature cheddar cheese, all topped with a buttery, crunchy Ritz cracker crust and baked until golden and bubbling.

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Prep Time 15 minutes mins

Cook Time 30 minutes mins

Total Time 45 minutes mins

Servings: 6 servings

Course: Main Course

Cuisine: American

Calories: 420

Ingredients Method Notes

Ingredients

  

• 900 g fresh broccoli florets about 2 large heads
• 1 tablespoon unsalted butter plus extra for the dish
• 1 medium yellow onion finely chopped (about 150g)
• 2 cloves garlic minced
• 1 x 400g tin condensed cream of mushroom soup
• 200 ml full-fat sour cream
• 1 teaspoon Dijon mustard
• ½ teaspoon freshly ground black pepper
• ¼ teaspoon fine sea salt
• 300 g mature cheddar cheese grated (plus extra for the top)
• 50 g unsalted butter melted (for the topping)
• 70 g Ritz crackers about 1 sleeve, finely crushed

Method

 

1. Preheat and Prepare the Broccoli: Set your oven to 180°C (350°F). Grease a 23x33cm baking dish with a little butter. Bring a large pot of salted water to a rolling boil. Add the broccoli florets and blanch for exactly 2 minutes. You’re looking for them to turn a bright, vivid green and become just tender when pierced with a knife, but they should still have a slight resistance. Drain immediately into a colander and rinse with cold water to stop the cooking process. Set aside.
2. Sweat the Aromatics: In a large frying pan, melt 1 tablespoon of butter over a medium heat. Add the finely chopped onion and cook for about 5 minutes, stirring occasionally, until it becomes translucent and soft, and you can smell its sweet, savoury aroma. Add the minced garlic and cook for a further 30 seconds until fragrant.
3. Build the Creamy Sauce: In a large mixing bowl, combine the tin of condensed mushroom soup, the sour cream, Dijon mustard, black pepper, and salt. Whisk everything together until it is completely smooth and a uniform pale beige in colour. Fold in the sautéed onion and garlic, then gently stir in 250g of the grated cheddar cheese until it is evenly distributed.
4. Combine and Assemble: Add the blanched and drained broccoli florets to the bowl with the sauce. Using a large rubber spatula, fold everything together gently but thoroughly, ensuring every single floret is coated in that luscious, cheesy sauce. The mixture should look thick and creamy, with bright green and white flecks throughout.
5. Transfer to the Dish: Spoon the broccoli mixture into the prepared baking dish and spread it into an even layer. Sprinkle the remaining 50g of grated cheddar cheese over the top, creating a first, melty blanket.
6. Make the Ritz Topping: In a small bowl, combine the finely crushed Ritz crackers with the 50g of melted butter. Stir with a fork until every crumb is moistened and the mixture resembles wet sand. Sprinkle this buttery crumb mixture evenly over the cheese layer.
7. Bake to Golden Perfection: Place the dish in the preheated oven, uncovered, and bake for 25 to 30 minutes. You'll know it's ready when you can see the sauce bubbling up around the edges of the dish, the whole casserole is steaming hot, and the Ritz topping has turned a deep, golden brown. The kitchen will smell gloriously of toasted butter and melted cheese.
8. The Crucial Rest: Remove the casserole from the oven and let it sit on the counter for at least 10 minutes before serving. This rest allows the sauce to settle and thicken slightly, meaning your servings will hold their shape on the plate rather than turning into a soupy puddle.

Notes

Let the casserole rest for at least 10 minutes after baking to allow the sauce to thicken for cleaner slices. For a lighter version, substitute low-fat sour cream and reduced-fat condensed soup.

I’ve been making this for over 3 years, and it never disappoints. It’s the dish I bring to potlucks, the one I make for Sunday dinners, and the one that always, always empties the pan. I truly hope you give it a try and see how a few simple ingredients can create something so genuinely satisfying. Let me know in the comments how yours turns out—I’d love to hear about it!