Bring a touch of Southern comfort to your table with this Yellow Squash Casserole recipe. This dish transforms simple squash into a rich, cheesy, and creamy casserole that feels like pure comfort in every bite. The combination of tender squash, savory cheeses, and a buttery cracker topping makes it a standout side dish that everyone will love.

From the very first forkful, you’ll enjoy the creamy texture, the subtle sweetness of the squash, and the crisp, buttery topping. It’s a dish that works beautifully at potlucks, holiday gatherings, or as a cozy addition to your weeknight dinner. Plus, it’s so easy to make and always earns rave reviews.
Whether you're cooking for family or hosting friends, this Yellow Squash Casserole brings warmth and flavor to any occasion. Ready to fill your kitchen with inviting aromas and smiles? Let’s dive into this cheesy, comforting, and crowd-pleasing recipe.
Yellow Squash Casserole: A Cheesy, Creamy, and Flavorful Side Dish
This Yellow Squash Casserole recipe turns fresh squash into a creamy, cheesy masterpiece that’s impossible to resist. With layers of melted cheddar, Parmesan, and a buttery cracker topping, this dish has the perfect mix of textures and flavors. It’s simple enough for everyday dinners but special enough for holidays and potlucks.
Here’s how to make this easy yet impressive casserole step by step. With clear instructions and helpful pro tips, you’ll have a side dish that everyone will talk about long after the meal is over.
Serving Suggestions:
Pro Tips for the Best Yellow Squash Casserole
- Drain Well: Make sure to drain the squash thoroughly after boiling to avoid a watery casserole.
- Mix Gently: Fold the squash into the cheese mixture carefully so the slices stay intact and the texture is perfect.
- Perfect Topping: Combine the crushed crackers and melted butter just before baking so the topping stays crisp and golden.
- Customize Flavors: Add chopped herbs like thyme or chives for a fresh twist, or a dash of cayenne for gentle heat.
- Let It Rest: Allow the casserole to cool for a few minutes before serving to help it set and make slicing easier.

Yellow Squash Casserole Recipe
- Preparation time: 20 minutes
- Cooking time: 30 minutes
- Servings: 8
- Equipment: Large pot, mixing bowl, 9x13-inch baking dish, strainer
This Yellow Squash Casserole recipe is a comforting side dish that delivers creamy, cheesy, and buttery flavors in every bite.
Ingredients:
- 4 cups yellow squash, sliced
- 1 large onion, chopped
- 1 cup shredded cheddar cheese
- ½ cup grated Parmesan cheese
- 1 cup sour cream
- ¼ cup mayonnaise
- 2 large eggs, beaten
- 1 teaspoon salt
- ½ teaspoon black pepper
- ½ teaspoon garlic powder
- ½ teaspoon onion powder
- 1 cup crushed buttery crackers (like Ritz)
- 2 tablespoons butter, melted
Directions:
- Preheat and Prepare: Preheat your oven to 350°F. Grease a 9x13-inch baking dish with non-stick spray or butter to make sure the casserole comes out easily.
- Cook the Squash and Onion: In a large pot, bring water to a boil. Add the sliced squash and chopped onion. Cook for about 5 minutes until just tender. Drain them thoroughly and set aside to cool slightly.
- Make the Cheese Mixture: In a large mixing bowl, combine the cheddar cheese, Parmesan cheese, sour cream, mayonnaise, and beaten eggs. Add the salt, black pepper, garlic powder, and onion powder. Stir everything together until the mixture is smooth and well combined.
- Combine with Squash: Gently fold the cooked squash and onion into the cheese mixture. Make sure all the slices are coated evenly to get that creamy consistency throughout the dish.
- Assemble the Casserole: Pour the squash mixture into the prepared baking dish. Use a spatula to spread it evenly and smooth the top so it bakes beautifully.
- Add the Topping: In a small bowl, mix the crushed buttery crackers with the melted butter until the crumbs are coated. Sprinkle this mixture evenly over the top of the casserole for that classic crispy finish.
- Bake the Dish: Place the casserole in the preheated oven and bake for 25 to 30 minutes, or until the top is golden brown and the edges are bubbling.
- Cool and Serve: Let the casserole rest for about 5 to 10 minutes before serving. This helps it set, making it easier to slice and serve neatly.
Ready to Relish!
Yellow Squash Casserole is the ultimate comfort side dish, bringing creamy texture and cheesy flavor to any meal. Pair it with roasted chicken, grilled meats, or even enjoy it as a vegetarian main dish alongside a fresh green salad.
Storage Solutions:
Store any leftovers in an airtight container in the refrigerator for up to three days. Reheat in the oven or microwave until hot and bubbly, and enjoy that comforting goodness all over again.
With this Yellow Squash Casserole recipe, you’ll bring a taste of cozy, homestyle cooking to your table. Watch as it disappears quickly, leaving only happy faces and empty plates!
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Yellow Squash Casserole
This Yellow Squash Casserole recipe is a comforting side dish that delivers creamy, cheesy, and buttery flavors in every bite.
- Total Time: 50 minutes
- Yield: 8 1x
Ingredients
-
4 cups yellow squash, sliced
-
1 large onion, chopped
-
1 cup shredded cheddar cheese
-
½ cup grated Parmesan cheese
-
1 cup sour cream
-
¼ cup mayonnaise
-
2 large eggs, beaten
-
1 teaspoon salt
-
½ teaspoon black pepper
-
½ teaspoon garlic powder
-
½ teaspoon onion powder
-
1 cup crushed buttery crackers (like Ritz)
-
2 tablespoons butter, melted
Instructions
-
Preheat and Prepare: Preheat your oven to 350°F. Grease a 9x13-inch baking dish with non-stick spray or butter to make sure the casserole comes out easily.
-
Cook the Squash and Onion: In a large pot, bring water to a boil. Add the sliced squash and chopped onion. Cook for about 5 minutes until just tender. Drain them thoroughly and set aside to cool slightly.
-
Make the Cheese Mixture: In a large mixing bowl, combine the cheddar cheese, Parmesan cheese, sour cream, mayonnaise, and beaten eggs. Add the salt, black pepper, garlic powder, and onion powder. Stir everything together until the mixture is smooth and well combined.
-
Combine with Squash: Gently fold the cooked squash and onion into the cheese mixture. Make sure all the slices are coated evenly to get that creamy consistency throughout the dish.
-
Assemble the Casserole: Pour the squash mixture into the prepared baking dish. Use a spatula to spread it evenly and smooth the top so it bakes beautifully.
-
Add the Topping: In a small bowl, mix the crushed buttery crackers with the melted butter until the crumbs are coated. Sprinkle this mixture evenly over the top of the casserole for that classic crispy finish.
-
Bake the Dish: Place the casserole in the preheated oven and bake for 25 to 30 minutes, or until the top is golden brown and the edges are bubbling.
-
Cool and Serve: Let the casserole rest for about 5 to 10 minutes before serving. This helps it set, making it easier to slice and serve neatly.
- Prep Time: 20 minutes
- Cook Time: 30 minutes






