Cheesy Squash Casserole: Creamy Southern Yellow Squash Bake with Ritz Cracker Topping

This cheesy squash casserole is the Southern side dish that absolutely steals the show at every dinner table it appears on — and I mean that without a single exaggeration. Tender sliced yellow squash layered in a rich creamy cheddar and cream cheese sauce seasoned with a hint of Cajun spice, topped with a golden buttery Ritz cracker crust that bakes into the most satisfying crunch imaginable. I have been making this cheesy squash casserole at Golden Recipes for years and it converts everyone who claims not to like squash — every single time without fail. The secret is in the cream cheese cheddar sauce that transforms humble yellow squash into something deeply indulgent and completely irresistible. This is the casserole that disappears first at every potluck and holiday dinner.

Why You’ll Love This Cheesy Squash Casserole

Drawing out the moisture from the squash before baking is the single technique that separates a great squash casserole from a watery disappointing one. Yellow squash contains an enormous amount of moisture — if you skip this step the casserole becomes soupy and the cheese sauce separates. Salting the sliced squash and letting it sit on paper towels draws out the excess liquid before the casserole goes together — and the result is a concentrated deeply flavored squash that holds its shape beautifully in the creamy sauce and develops gorgeous golden edges during baking.

The cream cheese and sharp cheddar sauce is the element that makes this casserole genuinely indulgent rather than just a simple vegetable side dish. The cream cheese adds an incredible richness and body that turns the cream-based sauce into something silky and luxurious. The sharp cheddar adds bold tangy depth. And the Cajun seasoning — just a touch — adds a warmth and complexity that elevates the whole dish from simple to spectacular. If you love vegetarian casseroles you should also check out our French Onion Broccoli Cheese Casserole and our Cheesy Scalloped Potatoes for more incredible cheesy vegetarian sides.

Equipment You’ll Need

• Large rimmed baking sheet or 9×13 baking dish
• Medium saucepan for the cream sauce
• Mandoline or sharp knife for slicing squash
• Paper towels for drawing moisture
• Small bowl for the cracker topping
• Measuring cups and spoons

Ingredients

• 3 lbs yellow summer squash, sliced ¼-inch thick
• 1 teaspoon salt — for drawing out moisture
• 1 medium onion, thinly sliced
• 1 red bell pepper, diced
• 2 tablespoons butter
• 3 cloves garlic, minced
• 4 oz cream cheese, softened and cubed
• ½ cup sour cream
• ½ cup whole milk
• 1 teaspoon Cajun seasoning
• ½ teaspoon garlic powder
• Salt and black pepper to taste
• 2 cups freshly shredded sharp cheddar cheese — divided

For the Ritz Cracker Topping

• 1½ cups crushed Ritz crackers
• 4 tablespoons butter, melted
• ¼ teaspoon garlic powder

Substitutions

Zucchini can replace or supplement the yellow squash — use a 50/50 mix for beautiful green and yellow color. Mexican cheese blend or Colby Jack can replace sharp cheddar for a milder result. For extra heat use pepper jack and increase the Cajun seasoning to 1½ teaspoons. Crushed cornflakes or panko mixed with melted butter can replace Ritz crackers for a different texture. For a complete meal add 2 cups of shredded rotisserie chicken to the cheese sauce before layering. Homemade Cajun seasoning — smoked paprika, garlic powder, onion powder, cayenne, oregano, black pepper — can replace store-bought.

How to Make Cheesy Squash Casserole

Draw Out the Moisture

Preheat your oven to 375°F (190°C) and grease your baking dish. Place the sliced squash in a single layer on paper towels. Sprinkle generously with salt on both sides. Let sit for 15 minutes — you will see beads of moisture forming on the surface. Pat completely dry with fresh paper towels. This step is absolutely non-negotiable — skipping it results in a watery casserole.

Sauté the Aromatics

Melt the butter in a medium saucepan over medium heat. Add the sliced onion and diced red bell pepper and cook for 5 to 6 minutes until softened and slightly golden. Add the garlic and cook for 1 minute. The kitchen should smell incredible.

Make the Cream Cheese Cheddar Sauce

Add the cream cheese cubes, sour cream, and milk to the skillet. Stir over medium-low heat until the cream cheese is completely melted and the sauce is smooth and unified. Add the Cajun seasoning, garlic powder, salt, and pepper. Remove from heat and stir in 1½ cups of the shredded cheddar until fully melted and the sauce is glossy and golden.

Layer and Top

Arrange half the dried squash slices in an overlapping layer across the bottom of the baking dish. Pour half the cream cheese cheddar sauce evenly over the squash. Arrange the remaining squash slices on top. Pour the remaining sauce over the second squash layer making sure every slice is covered. Scatter the remaining ½ cup of cheddar across the top. In a small bowl combine the crushed Ritz, melted butter, and garlic powder and scatter evenly across the entire top.

Bake

Bake uncovered for 35 to 40 minutes until the Ritz topping is deeply golden, the cheese is bubbling, and the squash is completely tender when pierced with a fork. The top should look spectacular — golden and buttery and inviting. Rest for 5 minutes and serve straight from the dish.

Variations

• Zucchini squash mix — use half yellow squash and half zucchini for a beautiful green and yellow two-tone casserole
• Chicken addition — add 2 cups of shredded rotisserie chicken to the sauce for a complete main course
• Four cheese version — use cheddar, Monterey Jack, mozzarella and Parmesan for an ultra-complex cheese sauce
• Sheet pan style — bake on a large rimmed sheet pan instead of a casserole dish for maximum crispy edges on every portion
• Jalapeño version — add diced fresh jalapeño to the sautéed aromatics for a spicy Southern version

What to Serve With It

This cheesy squash casserole is a spectacular side dish for virtually any main course — roasted chicken, grilled pork chops, glazed ham, or beef brisket all pair beautifully with the creamy cheesy squash. For a vegetarian spread serve alongside our French Onion Broccoli Cheese Casserole for two incredible cheesy vegetable side dishes that make any dinner table feel completely special. Warm dinner rolls round out the meal perfectly.

Pro Tips

• Salt and dry the squash — the most important step, skipping it makes the casserole watery
• Pat completely dry after salting — use fresh dry paper towels for best results
• Always bake uncovered — the Ritz topping must have direct heat to become golden and crispy
• Add cheese to sauce off the heat — keeps it silky instead of grainy
• Don’t overcrowd the squash layers — overlapping slightly is fine but thick bunched layers won’t cook evenly

Common Mistakes

• Skipping the salting step — the casserole becomes watery and the sauce separates
• Not patting the squash dry after salting — surface moisture prevents caramelization
• Covering while baking — the Ritz topping goes soggy
• Using cold cream cheese — creates lumps in the sauce
• Not tasting the sauce before assembling — adjust Cajun seasoning and salt before layering

Storage and Reheating

Store covered in the fridge for up to 3 days. To reheat and restore the cracker topping crunch scatter fresh crushed Ritz across the top and bake at 375°F for 15 minutes. Microwave works on medium power but the topping softens. Do not freeze — the squash releases significant moisture after freezing and the texture becomes unpleasant.

FAQ

Why is my squash casserole watery?
Almost always because the squash was not properly salted and dried before baking. Yellow squash contains enormous amounts of moisture — the salting and patting dry step removes it before it ends up in your casserole. Always complete this step fully.

Can I use zucchini instead of yellow squash?
Yes — zucchini works perfectly and the salting step is equally important. A mix of half yellow squash and half zucchini gives a beautiful color contrast and slightly different flavor depth.

Can I make this ahead?
Assemble without the Ritz topping and refrigerate up to 24 hours. Add the cracker topping right before baking and bake as directed adding 10 extra minutes.

What Cajun seasoning do you recommend?
Tony Chachere’s is the gold standard for Cajun seasoning and gives the most authentic Southern result. Any store-bought Cajun blend works well. If using a sodium-heavy blend reduce the additional salt in the recipe accordingly.

Conclusion

This Cheesy Squash Casserole is the Southern side dish that converts squash skeptics and steals the show at every table. Creamy Cajun cheddar sauce, tender yellow squash, and that spectacular golden Ritz cracker crust — make it once and it earns a permanent spot at every family dinner.