Zucchini and yellow squash casserole is a comforting, versatile side dish that highlights the mild sweetness and tender texture of summer squash. Combining these vegetables with creamy cheese and crunchy topping creates a perfect balance of flavors and textures, making it a crowd-pleaser for family dinners or holiday meals.
Ingredients
- 3 medium zucchinis, sliced into 1/4-inch rounds (about 4 cups)
- 3 medium yellow squash, sliced into 1/4-inch rounds (about 4 cups)
- 1 medium onion, finely chopped
- 2 cloves garlic, minced
- 1 cup shredded sharp cheddar cheese
- 1/2 cup grated Parmesan cheese
- 1 cup sour cream
- 1/2 cup mayonnaise
- 1 large egg, beaten
- 1 cup crushed buttery crackers (such as Ritz)
- 2 tablespoons unsalted butter, melted
- 1 teaspoon salt
- 1/2 teaspoon black pepper
- 1/2 teaspoon dried thyme or Italian seasoning
- 2 tablespoons olive oil or vegetable oil
Instructions
- Preheat your oven to 350°F (175°C). Lightly grease a 9×13-inch baking dish with butter or nonstick spray.
- In a large skillet, heat the olive oil over medium heat. Add the chopped onion and sauté for 4-5 minutes until translucent and soft.
- Add the minced garlic to the skillet and cook for another 30 seconds until fragrant, being careful not to burn it. Remove from heat and set aside.
- In a large mixing bowl, combine the sliced zucchini and yellow squash. Sprinkle with salt and toss gently. Let sit for 10 minutes to draw out excess moisture.
- After 10 minutes, use a clean kitchen towel or cheesecloth to squeeze out as much liquid as possible from the squash to prevent a watery casserole.
- Add the sautéed onions and garlic, sour cream, mayonnaise, beaten egg, shredded cheddar cheese, grated Parmesan, black pepper, and dried thyme to the bowl with the squash. Mix gently until all ingredients are evenly combined.
- Transfer the mixture to the prepared baking dish and spread it evenly.
- In a small bowl, combine the crushed crackers with the melted butter. Sprinkle this mixture evenly over the top of the casserole to create a golden, crunchy crust.
- Bake uncovered for 35-40 minutes, or until the topping is golden brown and the casserole is bubbling around the edges.
- Remove from oven and let the casserole cool for 5-10 minutes before serving. This helps it set and makes it easier to serve.
Tips
- Substitutions: You can swap sour cream for plain Greek yogurt for a tangier, lighter option. If you prefer, use mozzarella or Monterey Jack cheese instead of cheddar for a milder flavor.
- Drain Squash Well: Removing excess moisture from zucchini and yellow squash is crucial to avoid a soggy casserole. Press gently but thoroughly with a towel after salting.
- Make Ahead: Prepare the casserole up to the baking step, cover with foil, and refrigerate for up to 24 hours. Add 5-10 extra minutes to baking time if baking from cold.
- Cracker Topping Alternatives: For a gluten-free option, use crushed gluten-free crackers or toasted breadcrumbs. Panko breadcrumbs also work well for extra crunch.
Serving Suggestions
This zucchini and yellow squash casserole pairs beautifully with grilled or roasted meats such as chicken, pork chops, or steak. It also complements a simple green salad or steamed rice for a balanced vegetarian meal. Serve warm as a hearty side dish during family dinners, potlucks, or holiday gatherings.
Variations
To customize your casserole, try adding cooked crumbled bacon or diced ham for a smoky flavor. For a Mediterranean twist, mix in sun-dried tomatoes, black olives, and fresh basil. You can also incorporate other vegetables like chopped bell peppers, mushrooms, or spinach for added color and nutrition. For a vegan version, substitute the dairy ingredients with plant-based yogurt and cheese, and use a flax egg (1 tablespoon ground flaxseed mixed with 3 tablespoons water) instead of the beaten egg.
Storage and Reheating
Store any leftover casserole in an airtight container in the refrigerator for up to 3 days. To reheat, cover the casserole with foil and bake at 350°F (175°C) for 15-20 minutes until warmed through. Alternatively, microwave individual portions on medium power for 2-3 minutes, stirring halfway for even heating. Avoid freezing the casserole as the texture of the squash and topping may degrade after thawing.
Frequently Asked Questions
Can I use frozen zucchini or yellow squash for this casserole?
While fresh squash is best for texture and flavor, you can use frozen squash if needed. Make sure to thaw completely and drain very well to remove excess water before mixing into the casserole to prevent sogginess.
Is it necessary to peel the zucchini or yellow squash?
No, peeling is optional. The skin is edible and adds color and nutrients. Just be sure to wash the squash thoroughly before slicing.
How can I make this casserole dairy-free?
Replace the cheddar and Parmesan with dairy-free cheese alternatives, and use dairy-free sour cream or plain coconut yogurt. For the mayonnaise, choose a vegan version. The texture and flavor will be slightly different but still delicious.
Can I prepare this casserole ahead of time?
Yes, you can assemble the casserole a day in advance and refrigerate it covered. When ready to bake, increase the oven time by about 5-10 minutes to ensure it heats through completely.
What is the best way to prevent the casserole from becoming watery?
The key is to salt and drain the sliced squash before mixing with other ingredients. This draws out excess moisture. Using a clean towel to press and squeeze the squash helps maintain a firm texture in the finished casserole.
Can I add herbs or spices to change the flavor?
Absolutely! Fresh herbs like parsley, chives, or dill can brighten the dish. Spices such as paprika, cayenne, or nutmeg add warmth and depth. Adjust to your taste preferences for a personalized casserole.
This zucchini and yellow squash casserole recipe is a reliable, crowd-pleasing dish that highlights fresh summer produce with creamy, cheesy comfort. Its adaptability makes it a great addition to any meal plan.
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