Yellow summer squash casserole is a comforting and flavorful side dish that highlights the mild sweetness and tender texture of fresh summer squash. This casserole works well because the squash is combined with a creamy base, savory seasonings, and a crispy topping, creating a delightful contrast of textures and flavors. It’s a perfect way to enjoy summer squash in a family-friendly, easy-to-make dish that pairs well with a variety of main courses.
Ingredients
- 4 cups yellow summer squash, thinly sliced (about 3 medium squash)
- 1 medium onion, finely chopped
- 1 cup shredded sharp cheddar cheese
- 1/2 cup grated Parmesan cheese
- 1 cup sour cream
- 1/2 cup mayonnaise
- 2 large eggs, lightly beaten
- 1 cup crushed buttery crackers (such as Ritz)
- 2 tablespoons unsalted butter, melted
- 1 teaspoon garlic powder
- 1/2 teaspoon black pepper
- 1/2 teaspoon salt
- 1/2 teaspoon dried thyme or Italian seasoning (optional)
Instructions
- Preheat your oven to 350°F (175°C). Lightly grease a 9×13-inch baking dish with butter or nonstick spray.
- Wash and thinly slice the yellow summer squash into 1/4-inch rounds. Chop the onion finely.
- In a large skillet over medium heat, sauté the chopped onion with a little butter or oil until translucent, about 4-5 minutes. Remove from heat and let cool slightly.
- In a large mixing bowl, combine the sliced squash, sautéed onion, shredded cheddar cheese, Parmesan cheese, sour cream, mayonnaise, and beaten eggs. Add garlic powder, salt, pepper, and dried thyme or Italian seasoning if using. Stir gently until all ingredients are well incorporated.
- Pour the mixture into the prepared baking dish and spread it out evenly.
- In a small bowl, mix the crushed crackers with the melted butter until the crumbs are evenly coated.
- Sprinkle the buttery cracker topping evenly over the squash mixture.
- Bake uncovered in the preheated oven for 40-45 minutes, or until the casserole is bubbling around the edges and the topping is golden brown.
- Remove from the oven and let the casserole rest for 10 minutes before serving. This helps it set and makes it easier to cut.
Tips
- Substitutions: You can substitute the mayonnaise with Greek yogurt for a tangier, lighter version. For a dairy-free casserole, use vegan cheese and a plant-based sour cream alternative.
- Prevent watery casserole: Summer squash has high water content, so after slicing, sprinkle with a little salt and let it sit for 10 minutes, then gently squeeze out excess moisture using a clean kitchen towel or paper towels.
- Cheese choices: Sharp cheddar adds bold flavor, but feel free to mix in mozzarella for a milder taste or pepper jack for a spicy kick.
- Cracker topping: If you don’t have crackers, crushed cornflakes or breadcrumbs work well too and add a nice crunch.
Serving Suggestions
This yellow summer squash casserole is a versatile side dish that pairs beautifully with grilled or roasted chicken, pork chops, or fish. It also complements vegetarian mains like stuffed peppers or lentil loaf. Serve it warm alongside a fresh green salad or crusty bread for a complete meal. Leftovers make a tasty lunch option, especially when reheated and topped with a little extra cheese.
Variations
To customize your casserole, try adding cooked bacon or diced ham for a smoky, savory element. For extra veggies, stir in chopped bell peppers, mushrooms, or spinach before baking. You can also mix in a cup of cooked rice or quinoa to make the dish heartier and more filling. For a gluten-free version, substitute the cracker topping with crushed gluten-free crackers or almond meal.
Storage and Reheating
Store any leftover yellow summer squash casserole in an airtight container in the refrigerator for up to 3-4 days. To reheat, place a portion in a microwave-safe dish and microwave on medium power for 2-3 minutes or until heated through, stirring halfway. Alternatively, reheat in a 350°F (175°C) oven for 15-20 minutes, covered with foil to prevent drying out. This casserole also freezes well—wrap tightly and freeze for up to 2 months. Thaw overnight in the refrigerator before reheating as described.
Frequently Asked Questions
Can I use zucchini instead of yellow summer squash?
Yes, zucchini is a great substitute for yellow squash in this casserole. Both have similar textures and flavors, so you can use them interchangeably or even mix them together for added color and variety.
Do I need to peel the squash before making the casserole?
No need to peel summer squash—the skin is thin, tender, and packed with nutrients. Just be sure to wash the squash thoroughly before slicing.
How do I prevent the casserole from becoming soggy?
Because summer squash contains a lot of water, it’s important to remove excess moisture before mixing. Salting the sliced squash and letting it sit for 10 minutes, then squeezing out the liquid, helps keep the casserole firm and prevents sogginess.
Can I prepare this casserole ahead of time?
Yes! You can assemble the casserole a day in advance, cover it tightly, and refrigerate. When ready to bake, add the topping and bake as directed, adding a few extra minutes if the casserole is cold.
Is this dish suitable for vegetarians?
Absolutely. This recipe contains no meat and relies on cheese and eggs for protein, making it suitable for lacto-ovo vegetarians. To make it vegan, substitute dairy and eggs with plant-based alternatives.
What can I serve with yellow summer squash casserole for a complete meal?
This casserole pairs well with grilled meats like chicken or pork, roasted fish, or even hearty vegetarian mains. Add a crisp salad and some crusty bread or rice to round out the meal.
Yellow summer squash casserole is a versatile, crowd-pleasing dish that showcases fresh summer produce with creamy, cheesy goodness and a crunchy topping. Whether for a family dinner or potluck, this recipe is sure to become a favorite.
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