Zucchini & Squash Casserole
Healthy, simple, and fabulous, this Zucchini & Squash Casserole is the best healthy recipe for summer squash. Perfect for summer picnics, potlucks, or any holiday dinner, it combines vibrant flavors with a delightful texture. The casserole showcases the natural sweetness of zucchini and yellow squash while adding a crunchy topping that elevates its appeal.
Why You’ll Love This Recipe
- Easy to Prepare: With minimal prep time and straightforward steps, you can whip up this dish quickly.
- Flavorful Combination: The blend of fresh vegetables and seasonings creates a delicious flavor profile that everyone will enjoy.
- Versatile Side Dish: This casserole pairs well with various main courses, making it suitable for any occasion.
- Gluten-Free Option: Using gluten-free Panko breadcrumbs ensures that everyone can enjoy this tasty dish.
- Nutritious Ingredients: Packed with healthy veggies and low in calories, this casserole is a guilt-free indulgence.
Tools and Preparation
Gathering the right tools will make your cooking experience smoother and more enjoyable. Here are some essential items you’ll need for preparing the Zucchini & Squash Casserole.
Essential Tools and Equipment
- Sharp knife
- Cutting board
- 9-inch square baking dish
- Mixing bowl
- Aluminum foil
Importance of Each Tool
- Sharp knife: A sharp knife makes slicing through the zucchini and squash easier and safer.
- Baking dish: The right size baking dish ensures even cooking and presentation of your casserole.
- Mixing bowl: A mixing bowl helps combine ingredients thoroughly for an even flavor distribution.

Ingredients
For the Casserole
- 2 lbs. summer squash (zucchini and yellow squash, cut into ¼-inch slices)
- 2 ½ Tbsp. olive oil
- 1 ¼ tsp. salt (divided)
- ½ tsp. pepper
Topping
- ⅓ cup Parmesan cheese (grated)
- ⅓ cup Panko breadcrumbs (gluten-free)
- ¼ tsp. garlic powder
Garnish
- 2 Tbsp. fresh parsley (finely chopped)
How to Make Zucchini & Squash Casserole
Step 1: Preheat the Oven
Preheat your oven to 350 degrees Fahrenheit to ensure it’s hot enough when you’re ready to bake the casserole.
Step 2: Prepare the Vegetables
- Cut both yellow squash and zucchini into thin, uniform slices (¼-inch thick).
- Sprinkle ½ teaspoon of salt over the sliced vegetables.
- Let them sit for about 10 minutes to draw out excess moisture.
- Dab slices with a paper towel to remove any remaining moisture.
Step 3: Assemble the Casserole
- Spray a 9-inch square baking dish with non-stick cooking spray.
- Arrange the zucchini and squash slices in overlapping rows in the baking dish.
- Drizzle olive oil over the arranged vegetables.
- Sprinkle with remaining salt and pepper.
Step 4: Prepare the Topping
- In a small bowl, combine grated Parmesan cheese, gluten-free Panko breadcrumbs, and garlic powder.
- Toss until well mixed, then sprinkle evenly over the zucchini and squash.
Step 5: Bake
Cover the baking dish with aluminum foil and place it in preheated oven for 30 minutes.
Step 6: Broil for Crispiness
After baking, remove the foil, turn on high broil, and broil for an additional 5-7 minutes until the topping turns golden brown.
Step 7: Serve
Garnish with fresh parsley before serving warm. Enjoy your delicious Zucchini & Squash Casserole!
How to Serve Zucchini & Squash Casserole
Zucchini & Squash Casserole is versatile and can be served in various delightful ways. Whether you’re hosting a family gathering or enjoying a quiet dinner, these serving suggestions will enhance your meal experience.
Casual Family Dinner
- Serve alongside grilled chicken or turkey for a wholesome family meal.
- Pair with a fresh garden salad to add crunch and brightness.
Summer Picnics
- Bring the casserole in a portable dish for easy travel.
- Complement it with fresh fruit salads for a refreshing touch.
Holiday Gatherings
- Present it as a side dish at holiday dinners; its vibrant colors make it festive.
- Accompany with crusty bread or rolls to soak up any juices.
Potluck Parties
- Slice into squares for easy serving at potlucks.
- Offer with dips like hummus or tzatziki for extra flavor options.
Light Lunch
- Serve warm or cold as part of a light lunch spread.
- Pair with a protein like grilled shrimp or tofu for balance.
How to Perfect Zucchini & Squash Casserole
To ensure your Zucchini & Squash Casserole turns out perfectly every time, follow these helpful tips.
- Slice evenly: Uniform slices ensure even cooking and help the casserole maintain its shape.
- Remove excess moisture: Salting and dabbing the zucchini helps prevent a soggy casserole.
- Use fresh herbs: Fresh parsley adds flavor and color, enhancing the overall presentation.
- Broil at the end: Broiling gives the topping a beautiful golden finish, adding texture and appeal.
- Experiment with spices: Feel free to add your favorite spices like thyme or oregano for variation.
- Serve immediately: For the best taste and texture, serve right after baking while it’s still warm.
Best Side Dishes for Zucchini & Squash Casserole
Zucchini & Squash Casserole pairs wonderfully with many side dishes. Here are some great options to consider:
- Grilled Chicken – Juicy, marinated chicken complements the casserole’s flavors perfectly.
- Quinoa Salad – A refreshing salad mixed with vegetables adds nutrition and texture.
- Roasted Vegetables – Seasonal vegetables roasted until tender provide additional flavor variety.
- Garlic Bread – Crispy garlic bread is perfect for scooping up any leftover casserole bits.
- Coleslaw – A crunchy coleslaw adds a tangy contrast that enhances the meal experience.
- Herbed Rice – Fluffy rice infused with herbs rounds out the plate while keeping it light.
Common Mistakes to Avoid
Avoiding common mistakes can make your Zucchini & Squash Casserole even better. Here are some pitfalls to watch out for:
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Bold phrase: Not Removing Moisture – If you don’t dab the zucchini and squash slices, excess moisture can make the casserole soggy. Pat them dry with a paper towel after salting.
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Bold phrase: Skipping the Oven Preheat – Not preheating the oven can lead to uneven cooking. Always preheat your oven to ensure consistent baking.
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Bold phrase: Overcrowding the Dish – Piling too many layers of squash can prevent proper cooking. Arrange the slices in a single layer for even heat distribution.
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Bold phrase: Ignoring Seasoning – Failing to season adequately can result in bland flavors. Be sure to sprinkle salt and pepper over your layers before baking.
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Bold phrase: Forgetting Fresh Herbs – Neglecting fresh herbs like parsley at serving can miss an opportunity for freshness. Always garnish with herbs right before serving for added flavor.

Storage & Reheating Instructions
Refrigerator Storage
- Store leftovers in an airtight container.
- Keep in the refrigerator for up to 3 days.
Freezing Zucchini & Squash Casserole
- Freeze in a freezer-safe container.
- Can be stored for up to 3 months.
Reheating Zucchini & Squash Casserole
- Oven: Preheat to 350°F and bake until heated through, about 15-20 minutes.
- Microwave: Heat individual portions on high for 1-2 minutes or until warm.
- Stovetop: Warm in a skillet over medium heat, stirring occasionally until heated through.
Frequently Asked Questions
Here are some frequently asked questions about the Zucchini & Squash Casserole that might help you out.
Can I use different types of squash?
Yes! Feel free to mix different varieties of summer squash or even try adding other vegetables for variety.
How do I make this dish dairy-free?
To make it dairy-free, simply omit Parmesan cheese or substitute with nutritional yeast for a cheesy flavor without dairy.
What’s the best way to serve Zucchini & Squash Casserole?
This casserole works great as a side dish at barbecues, potlucks, or family dinners. Serve it warm alongside grilled meats or salads.
Can I prepare this casserole ahead of time?
Absolutely! You can assemble it a day ahead and refrigerate it before baking. Just allow extra baking time if it’s cold from the fridge.
How do I customize my Zucchini & Squash Casserole?
You can add spices like Italian seasoning or crushed red pepper flakes for extra flavor. Feel free to include other veggies like bell peppers or onions!
Final Thoughts
The Zucchini & Squash Casserole is not only healthy but also versatile and delicious. You can easily customize it by adding your favorite vegetables or adjusting the seasonings to suit your taste. Give this recipe a try; it’s perfect for any occasion!
Zucchini & Squash Casserole
Enjoy a delightful and healthy Zucchini & Squash Casserole that celebrates the vibrant flavors of summer vegetables. This casserole is perfect for summer picnics, potlucks, or holiday dinners, combining the natural sweetness of zucchini and yellow squash with a crunchy topping that adds texture and appeal. Easy to prepare, it’s a versatile side dish that pairs beautifully with grilled meats or fresh salads. Whether you’re looking for a guilt-free indulgence or a family-friendly recipe, this dish is bound to impress!
- Prep Time: 15 minutes
- Cook Time: 40 minutes
- Total Time: 55 minutes
- Yield: Serves about 8
- Category: Side Dish
- Method: Baking
- Cuisine: American
Ingredients
- 2 lbs. summer squash (zucchini and yellow squash)
- 2 ½ Tbsp. olive oil
- 1 ¼ tsp. salt (divided)
- ½ tsp. pepper
- ⅓ cup grated Parmesan cheese
- ⅓ cup gluten-free Panko breadcrumbs
- ¼ tsp. garlic powder
- Fresh parsley (for garnish)
Instructions
- Preheat your oven to 350°F.
- Slice zucchini and yellow squash into uniform ¼-inch slices. Sprinkle with ½ teaspoon of salt and let sit for 10 minutes to draw out moisture.
- Dab the slices dry with a paper towel. Spray a baking dish with non-stick spray and layer the vegetables in overlapping rows.
- Drizzle olive oil over the vegetables and season with remaining salt and pepper.
- In a bowl, mix Parmesan cheese, gluten-free Panko breadcrumbs, and garlic powder; sprinkle over the vegetable layers.
- Cover with aluminum foil and bake for 30 minutes. Remove foil and broil on high for an additional 5-7 minutes until golden brown.
- Garnish with fresh parsley before serving warm.
Nutrition
- Serving Size: 1/8 of casserole (approximately 150g)
- Calories: 180
- Sugar: 3g
- Sodium: 450mg
- Fat: 9g
- Saturated Fat: 2g
- Unsaturated Fat: 7g
- Trans Fat: 0g
- Carbohydrates: 20g
- Fiber: 4g
- Protein: 6g
- Cholesterol: 10mg