Parmesan Squash Casserole

Looking for a scrumptious way to savor the flavors of summer squash and zucchini? Look no further than this Parmesan Squash Casserole recipe! Bursting with layers of tender squash, tangy tomatoes, and a creamy, cheesy filling, this dish is bound to tantalize your taste buds and become a staple on your dinner table. Whether you’re serving it as a side dish or a main course, this casserole celebrates the vibrant essence of fresh vegetables in every mouthwatering bite.


  • 4 yellow squash and/or zucchini (approximately 8 cups sliced)
  • 1 tablespoon olive oil
  • 1 tablespoon minced garlic
  • 1 tablespoon fresh thyme leaves or 1/2 tsp dried thyme
  • Salt to taste
  • 2 tomatoes, sliced
  • 2 eggs
  • ⅓ cup sour cream
  • 1 cup crumbled feta cheese (not tightly packed)
  • 2 tablespoons grated Parmesan cheese
  • 1 tablespoon lemon juice
  • Salt and pepper to taste


  1. Preheat and Prep: Begin by preheating your oven to 375 degrees Fahrenheit. Next, generously spray a large casserole dish with nonstick spray to ensure easy cleanup later on. Then, slice your squash into 1/4-inch slices. If you’re using larger squash, consider cutting them down the middle before slicing for even cooking.
  2. Sauté the Squash: Heat the olive oil in a large non-stick frying pan over medium heat. Add the sliced squash, minced garlic, fresh thyme leaves, and salt to taste. Sauté and stir the mixture until the squash just starts to soften. Be mindful not to overcook, as we want to maintain that delightful crunch.
  3. Incorporate the Tomatoes: Once the squash is lightly sautéed, remove the pan from the heat and gently stir in the sliced tomatoes. This adds a burst of juicy freshness to our casserole.
  4. Prepare the Cheesy Filling: In a medium-sized bowl, beat together the eggs, sour cream, crumbled feta cheese, grated Parmesan cheese, and lemon juice until well combined. This creamy, cheesy mixture will infuse our casserole with irresistible flavor and texture.
  5. Layer and Bake: Now, it’s time to assemble our casserole. Begin by placing half of the sautéed squash mixture into the bottom of the prepared casserole dish. Sprinkle with salt and pepper to taste, then spread half of the egg mixture over the top. Repeat this layering process with the remaining squash and egg mixture.
  6. Final Touches: For an extra cheesy kick, top the casserole with additional crumbled feta and grated Parmesan cheese if desired. These savory toppings will form a golden, gooey crust as the casserole bakes to perfection.
  7. Bake and Serve: Pop the assembled casserole into the preheated oven and bake for 40-45 minutes, or until the mixture is bubbling and slightly set. Once done, serve hot and relish in the creamy, cheesy goodness of this Parmesan Squash Casserole.

Serving and Storage Tips:

Serving Tips:

  1. Garnish with Fresh Herbs: Before serving, sprinkle some freshly chopped herbs like parsley or basil over the casserole for a pop of color and added freshness.
  2. Pair with a Salad: Serve the Parmesan Squash Casserole alongside a crisp green salad dressed with a light vinaigrette to balance out the richness of the dish.
  3. Add a Protein: For a complete meal, consider serving the casserole with grilled chicken, fish, or tofu for an extra boost of protein.
  4. Toast Some Bread: Warm up some crusty bread or dinner rolls to serve on the side, perfect for soaking up any leftover cheesy goodness.
  5. Presentation Matters: Transfer the casserole to a decorative serving dish and garnish the edges with extra Parmesan cheese and a sprinkle of paprika for a polished presentation.

Storage Tips:

  1. Refrigerate Promptly: If you have any leftovers, allow the casserole to cool slightly, then transfer it to an airtight container and refrigerate within two hours of cooking to maintain freshness.
  2. Consume Within 3-4 Days: The Parmesan Squash Casserole will keep well in the refrigerator for up to 3-4 days. Simply reheat individual portions in the microwave or oven until warmed through.
  3. Freeze for Later: If you’d like to freeze the casserole for future meals, portion it into freezer-safe containers or wrap tightly with aluminum foil. It can be stored in the freezer for up to 2-3 months.
  4. Thaw Properly: When ready to enjoy, thaw the frozen casserole in the refrigerator overnight. Reheat in the oven at a low temperature to ensure even heating throughout.
  5. Refresh Before Serving: Before serving reheated leftovers, sprinkle a little extra cheese on top and bake for a few minutes to refresh the flavors and texture.


  1. Cheesy Herb Twist: Experiment with different types of cheese and herbs to customize the flavor profile of your casserole. Try substituting the feta cheese with shredded mozzarella or sharp cheddar, and swap the thyme for rosemary or oregano for a deliciously different taste sensation.
  2. Protein Power: Add some protein to your casserole by incorporating cooked diced chicken, crumbled bacon, or Italian sausage into the layers. This not only enhances the flavor but also turns the dish into a hearty main course.
  3. Veggie Medley: Mix things up by adding other vegetables to the casserole layers. Sautéed onions, bell peppers, or mushrooms can add depth of flavor and texture. You can also toss in some spinach or kale for extra nutritional value.
  4. Spice it Up: Give your casserole a kick by adding some heat. Sprinkle red pepper flakes or drizzle hot sauce over the layers for a spicy twist. Alternatively, incorporate diced jalapeños or green chilies for a flavor boost.
  5. Gluten-Free Option: For those following a gluten-free diet, substitute breadcrumbs with crushed gluten-free crackers or almond meal for the topping. This ensures everyone at the table can enjoy this delectable dish.
  6. Mediterranean Flair: Infuse your casserole with Mediterranean flavors by adding olives, sun-dried tomatoes, and a sprinkle of za’atar seasoning. Serve with a dollop of tzatziki sauce on the side for a refreshing contrast.
  7. Creamy Cauliflower: For a lighter version of the casserole, replace some of the squash with cauliflower florets. Steam or roast the cauliflower until tender before layering it with the other ingredients. This adds a creamy texture without sacrificing flavor.

FAQs :

  1. Can I use only one type of squash for this recipe?
    • Yes, absolutely! You can use either yellow squash or zucchini exclusively, or a combination of both, based on your preference and availability.
  2. Can I prepare this casserole ahead of time?
    • Yes, you can assemble the casserole ahead of time and refrigerate it until you’re ready to bake. Just be sure to allow for additional baking time if you’re starting with a chilled casserole.
  3. What can I serve with Parmesan Squash Casserole?
    • This casserole pairs well with a variety of dishes such as grilled meats, roasted chicken, or a simple green salad. It’s versatile enough to complement a wide range of main courses.
  4. Can I freeze leftovers of this casserole?
    • Yes, you can freeze leftovers of this casserole for future meals. Just be sure to store them in an airtight container or freezer-safe bag to maintain freshness.
  5. How do I know when the casserole is done baking?
    • The casserole is ready when it’s bubbling around the edges and the top is slightly golden brown. You can also insert a knife into the center to check if it comes out clean.
  6. Can I omit the eggs from the recipe?
    • While eggs help bind the casserole together and give it a creamy texture, you can omit them if you have dietary restrictions or preferences. However, note that the texture may be slightly different.
  7. Is this recipe suitable for vegetarians?
    • Yes, this recipe is vegetarian-friendly as it doesn’t contain any meat or animal products besides the eggs and dairy. Just be sure to use vegetarian-friendly cheese brands.
  8. Can I use dried herbs instead of fresh ones?
    • Yes, you can substitute dried herbs for fresh ones if needed. However, keep in mind that the flavor intensity may vary, so adjust the amount accordingly.
  9. What size casserole dish should I use?
    • A large casserole dish, approximately 9×13 inches, works well for this recipe. However, you can use a slightly smaller dish if needed, just adjust the baking time accordingly.

With just a handful of simple ingredients and easy-to-follow steps, this Parmesan Squash Casserole recipe offers a delightful way to elevate your summer dining experience. Whether you’re hosting a backyard barbecue or enjoying a cozy family dinner, this cheesy sensation is sure to impress. So, roll up your sleeves, gather your ingredients, and get ready to savor the irresistible flavors of summer in every mouthwatering bite!