Zucchini or Yellow Squash Casserole

Posted on December 25, 2025

Modified: December 25, 2025

By Sofia
A vibrant Zucchini or Yellow Squash Casserole in a white baking dish, topped with golden breadcrumbs and fresh parsley.

Ah, Zucchini or Yellow Squash Casserole, a dish that brings back the warmth of summer gardens and family gatherings! The creamy texture, combined with the slight sweetness of the squash, makes it a truly comforting dish. It reminds me of my grandmother’s garden overflowing with zucchini, just like the jalapeno corn casserole we’d have at every summer picnic.

Growing up, I remember eagerly anticipating the moment my grandmother would pull her Zucchini or Yellow Squash Casserole from the oven. The golden, bubbly top was always the first thing to disappear, as everyone reached for a spoonful of that cheesy goodness. It was a dish filled with love and laughter.

This Zucchini or Yellow Squash Casserole is not only incredibly hearty and comforting but also surprisingly easy to make. It’s a low-stress way to get a delicious and nutritious meal on the table. My tip? Don’t be afraid to experiment with different cheeses to find your perfect flavor combination!

What You Need to Make This Recipe

This Zucchini or Yellow Squash Casserole relies on simple, fresh ingredients. I especially adore the combination of sweet zucchini and the sharp cheddar, creating a delightful flavor balance. It’s a dish where each component shines. Much like a comforting bowl of easy manicotti, this casserole is sure to please. The full list of ingredients and measurements can be found in the recipe card below.

zucchini or yellow squash casserole recipe
Zucchini or Yellow Squash Casserole 4

How to Make Zucchini or Yellow Squash Casserole

Making this cheesy Zucchini or Yellow Squash Casserole is easier than you might think. It basically involves combining sautéed vegetables with a creamy cheese sauce, topping it with buttery cracker crumbs, and baking it to golden perfection. This recipe always makes me think of other comfort food classics, like a warm and cheesy shrimp and grits casserole.

A vibrant Zucchini or Yellow Squash Casserole in a white baking dish, topped with golden breadcrumbs and fresh parsley.
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Cheesy Zucchini or Yellow Squash Casserole

A comforting and flavorful casserole featuring fresh zucchini or yellow squash, a creamy cheese sauce, and a buttery cracker topping. Perfect as a side dish or light meal!
Prep Time 20 minutes
Cook Time 35 minutes
Total Time 55 minutes
Servings: 6 servings
Course: Main Course, Side Dish
Cuisine: American
Calories: 350

Ingredients
  

  • 3 lbs Zucchini or Yellow Squash sliced 1/4 inch thick
  • 1 medium Yellow Onion chopped
  • 2 cloves Garlic minced
  • 4 tbsp Butter unsalted
  • 4 tbsp All-Purpose Flour
  • 2 cups Milk whole milk recommended
  • 1 tsp Salt
  • 1/2 tsp Black Pepper freshly ground
  • 1/4 tsp Nutmeg ground
  • 2 cups Cheddar Cheese shredded
  • 1/2 cup Parmesan Cheese grated
  • 1 1/2 cups Ritz Crackers crushed
  • 6 tbsp Butter melted

Equipment

  • 9x13 inch baking dish
  • Large Skillet
  • Mixing Bowl

Method
 

  • Preheat oven to 350°F (175°C). Lightly grease a 9x13 inch baking dish.
  • In a large skillet, heat 2 tablespoons of olive oil over medium heat. Add the sliced zucchini or yellow squash and chopped onion. Cook, stirring occasionally, until the vegetables are tender-crisp, about 8-10 minutes. Add the minced garlic and cook for another minute until fragrant. Remove from heat and set aside.
  • In a medium saucepan, melt the 4 tablespoons of butter over medium heat. Whisk in the flour and cook for 1-2 minutes, stirring constantly, to form a roux.
  • Gradually whisk in the milk until smooth. Bring to a simmer, stirring constantly, and cook until the sauce has thickened, about 3-5 minutes.
  • Remove from heat and stir in the salt, pepper, and nutmeg. Add the cheddar cheese and parmesan cheese, stirring until the cheese is melted and the sauce is smooth.
  • Pour the cheese sauce over the cooked zucchini or yellow squash and onion mixture in the skillet. Stir gently to combine.
  • Transfer the mixture to the prepared baking dish.
  • In a small bowl, combine the crushed Ritz crackers and melted butter. Mix well.
  • Sprinkle the cracker topping evenly over the casserole.
  • Bake in the preheated oven for 25-30 minutes, or until the casserole is bubbly and the topping is golden brown.
  • Let the casserole cool for a few minutes before serving.

Notes

For a spicier casserole, add a pinch of red pepper flakes to the cheese sauce. The casserole can be assembled ahead of time and refrigerated for up to 24 hours before baking. If baking from chilled, add 10-15 minutes to the baking time. Store leftovers in the refrigerator for up to 3 days.

Pro Tips for Making This Zucchini or Yellow Squash Casserole

Here are some of my tried-and-true tips to help you create the perfect Zucchini or Yellow Squash Casserole every time:

  • Don’t skip the sauté: Sautéing the zucchini, yellow squash, onion, and garlic beforehand is so important. It helps to release their flavors and soften them, so they’re tender in the final dish.

  • Grate your own cheese: Pre-shredded cheese often contains cellulose, which can prevent it from melting smoothly. Grating your own cheese ensures a perfectly creamy sauce.

  • My Secret Trick: To prevent the cracker topping from burning, I always tent the casserole with foil during the last 10 minutes of baking. This ensures the cheese is bubbly and the topping is perfectly golden, never burnt.

Fun Variations for Zucchini or Yellow Squash Casserole

Want to add a little twist to your Zucchini or Yellow Squash Casserole? Here are a few easy substitutions and variations that I love:

  • Spice it up: Add a pinch of red pepper flakes to the cheese sauce for a touch of heat.

  • Add protein: Stir in some cooked diced ham or crumbled bacon for a heartier dish.

  • Use different cheeses: Experiment with different cheeses like Gruyere, Monterey Jack, or even a bit of goat cheese for a unique flavor profile.

  • Go gluten-free: Substitute the all-purpose flour with a gluten-free blend and use gluten-free crackers for the topping.

What to Serve With Zucchini or Yellow Squash Casserole

Zucchini or Yellow Squash Casserole makes a wonderful side dish for a variety of meals. Here are a few of my favorite pairings:

  • Grilled Chicken or Fish: The creamy casserole complements the smoky flavors of grilled meats perfectly.

  • Roasted Pork Loin: A classic pairing that is both comforting and satisfying.

  • Simple Salad: A light and refreshing salad provides a nice contrast to the richness of the casserole.

My tip is to always have a bright and flavorful side to balance the richness of the casserole.

How to Store Zucchini or Yellow Squash Casserole

Leftover Zucchini or Yellow Squash Casserole can be stored in an airtight container in the refrigerator for up to 3 days. For longer storage, you can freeze it for up to 2 months. When reheating, I recommend doing it slowly in the oven to prevent the casserole from drying out. I always reheat it in a glass container!

Nutritional Benefits

This Zucchini or Yellow Squash Casserole is packed with vitamins and minerals from the zucchini and yellow squash, offering a good source of Vitamin C and potassium. It’s a family-friendly way to sneak in some extra veggies.

FAQs

Can I make this Zucchini or Yellow Squash Casserole ahead of time?

Yes, you can assemble the Zucchini or Yellow Squash Casserole a day ahead. Just keep it covered in the refrigerator and bake it according to the recipe instructions when you’re ready to serve.

Can I freeze the Zucchini or Yellow Squash Casserole?

Absolutely! Allow the Zucchini or Yellow Squash Casserole to cool completely, then wrap it tightly in plastic wrap and aluminum foil. Freeze for up to 2 months. Thaw it overnight in the refrigerator before reheating.

What if I don’t have Ritz crackers?

If you don’t have Ritz crackers on hand, you can use other buttery crackers or even breadcrumbs. Just be sure to toss them with melted butter for that signature crispy topping for your Zucchini or Yellow Squash Casserole.

Can I add other vegetables to this Zucchini or Yellow Squash Casserole?

Yes, feel free to get creative! Sliced mushrooms, bell peppers, or even spinach would be delicious additions to this Zucchini or Yellow Squash Casserole. Just be sure to sauté them along with the zucchini and onion.

Conclusion

This Zucchini or Yellow Squash Casserole is more than just a side dish; it’s a warm, comforting hug on a plate. It’s easy to make, packed with flavor, and perfect for busy families. Like a monte cristo breakfast casserole, it’s sure to become a new family favorite. So, gather your ingredients, preheat your oven, and get ready to enjoy this cheesy, veggie-filled delight!

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