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Creamy Yellow Squash Casserole with Ritz Topping

Few side dishes bring as much comfort as a warm casserole, and this Creamy Yellow Squash Casserole with Ritz Topping is one of the best. Tender squash and onions are mixed with a creamy, cheesy base, then baked under a golden, buttery Ritz cracker topping. It’s a dish that feels rich, homestyle, and satisfying, yet it’s made with simple ingredients you likely already have in your kitchen. Perfect for family dinners, potlucks, or holiday spreads, this casserole is a classic Southern recipe that turns fresh vegetables into a crowd-pleasing side dish. The creamy filling contrasts beautifully with the crunchy topping, making every bite both cozy and indulgent.
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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings: 8 portions
Ingredients Equipment Method Notes

Ingredients
  

  • 4 medium yellow squash sliced
  • 1 small onion finely diced
  • 1 cup cheddar cheese shredded
  • 1 cup sour cream
  • 2 tbsp butter plus more for greasing dish
  • 1 cup Ritz crackers crushed
  • Salt and black pepper to taste

Equipment

  • Cutting board & sharp knife
  • Large skillet
  • Mixing bowls (medium and large)
  • Measuring cups & spoons
  • Wooden spoon or spatula
  • 9x13-inch baking dish
  • Oven

Method
 

Step 1: Preheat the Oven
  1. Preheat your oven to 350°F (175°C). Lightly grease a 9x13-inch baking dish with butter.
Step 2: Cook the Vegetables
  1. In a large skillet, melt 1 tablespoon butter over medium heat. Add sliced squash and diced onion. Cook for 8–10 minutes, stirring occasionally, until softened. Season lightly with salt and pepper.
Step 3: Make the Creamy Filling
  1. In a large bowl, combine the cooked squash mixture with sour cream and shredded cheddar cheese. Mix until well blended.
Step 4: Transfer to Baking Dish
  1. Spread the squash mixture evenly into the prepared baking dish.
Step 5: Prepare the Ritz Topping
  1. In a small bowl, melt the remaining 1 tablespoon butter. Mix with crushed Ritz crackers until coated.
Step 6: Add Topping
  1. Sprinkle the buttery cracker crumbs evenly over the casserole.
Step 7: Bake the Casserole
  1. Bake uncovered for 25–30 minutes, or until the topping is golden brown and crispy.
Step 8: Serve & Enjoy
  1. Remove from the oven and let cool slightly before serving warm.

Notes

🧊 Storage & Reheating
Refrigerator: Store leftovers in an airtight container for up to 3 days.
Freezer: Freeze unbaked casserole (without topping) for up to 2 months. Add topping just before baking.
Reheating: Warm in the oven at 350°F (175°C) for 15–20 minutes, or microwave in 1-minute intervals.
🥄 Variations
Cheesy Upgrade: Use a mix of cheddar and mozzarella for extra gooeyness.
Spicy Twist: Add ½ tsp red pepper flakes or diced jalapeños.
Veggie Mix: Stir in zucchini or bell peppers with the squash.
Herb Flavor: Add fresh thyme or parsley to the filling.
Low-Carb Option: Replace crackers with crushed pork rinds or almond flour topping.
❓ 10 FAQs
Can I use zucchini instead of yellow squash?
Yes—zucchini works beautifully or use a mix of both.
Do I need to peel the squash?
No, the skin softens during cooking, so leave it on.
Can I make this casserole ahead of time?
Yes, assemble the filling and refrigerate. Add topping and bake when ready.
Can I use Greek yogurt instead of sour cream?
Yes, it works as a lighter substitute.
What can I use instead of Ritz crackers?
Saltines, panko breadcrumbs, or buttery croutons.
Can I double the recipe?
Absolutely—use a larger baking dish and extend bake time by 5–10 minutes.
Can I freeze leftovers?
It’s best fresh, but leftovers can be frozen for up to 1 month.
What cheese works best?
Sharp cheddar gives the best flavor, but Swiss or Monterey Jack also work.
Why is my casserole watery?
Be sure to cook squash until most liquid evaporates before mixing.
What can I serve with this casserole?
It pairs perfectly with roasted chicken, grilled meats, or holiday roasts.
🏁 Conclusion
This Creamy Yellow Squash Casserole with Ritz Topping is comfort food at its finest. It transforms simple squash into a rich, cheesy dish with a crispy, buttery topping that makes it irresistible.
Perfect for weeknight dinners or holiday meals, it’s easy to prepare, feeds a crowd, and tastes like Southern tradition in every bite. Once you try it, it’s sure to become a regular on your table.