Zucchini & Squash Casserole
Healthy, simple, and fabulous, this Zucchini & Squash Casserole is the best healthy recipe for summer squash. This easy casserole is perfect for summer picnics and potlucks, making it a versatile side dish for any holiday dinner. Its combination of flavors and textures makes it a standout choice that everyone will enjoy!
Why You’ll Love This Recipe
- Easy to Prepare: With just a few simple steps, you can whip up this delicious casserole in no time.
- Healthy Ingredients: Packed with fresh zucchini and summer squash, this dish is nutrient-dense and low in calories.
- Versatile Side Dish: Perfect for any occasion — from casual family dinners to festive holiday gatherings.
- Flavorful Topping: The crispy Panko and Parmesan topping adds a delightful crunch that complements the soft veggies beneath.
- Gluten-Free Option: Made with gluten-free Panko breadcrumbs, this casserole caters to various dietary needs.

Tools and Preparation
To make your Zucchini & Squash Casserole, you’ll need a few essential tools. These will help ensure your dish comes out perfectly every time.
Essential Tools and Equipment
- Baking dish (9-inch square)
- Non-stick cooking spray
- Knife
- Cutting board
- Mixing bowl
Importance of Each Tool
- Baking dish: A proper baking dish ensures even cooking and browning of your casserole.
- Non-stick cooking spray: Helps prevent sticking, making serving easier while keeping the casserole intact.
- Knife: A sharp knife allows for precise slicing of the vegetables, which enhances the presentation.
- Mixing bowl: Useful for combining ingredients efficiently before adding them to the baking dish.
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
- ⅓ cup Parmesan cheese (grated)
- ⅓ cup Panko breadcrumbs (gluten-free)
- ¼ tsp. garlic powder
- 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 prepare it for baking.
Step 2: Slice the Vegetables
Cut the yellow squash and zucchini into thin, ¼-inch slices.
Step 3: Remove Moisture
Sprinkle ½ teaspoon of salt over the zucchini and squash slices. Let them sit for 10 minutes to draw out moisture. Afterward, dab them with a paper towel to remove excess liquid.
Step 4: Prepare the Baking Dish
Spray a 9-inch square baking dish with non-stick cooking spray to prevent sticking.
Step 5: Layer the Vegetables
Arrange the zucchini and squash slices in overlapping rows in the baking dish. Aim to form about four rows.
Step 6: Add Seasonings
Drizzle olive oil over the layered zucchini and squash. Then sprinkle with remaining salt and pepper.
Step 7: Mix Topping Ingredients
In a small bowl, combine Parmesan cheese, Panko breadcrumbs, and garlic powder. Toss these ingredients together until well mixed.
Step 8: Add Topping
Sprinkle the breadcrumb mixture evenly over the zucchini and squash layers.
Step 9: Bake Covered
Cover your baking dish with aluminum foil and bake in the preheated oven for 30 minutes.
Step 10: Broil for Crispiness
Remove the foil from the baking dish. Turn on high broil and broil for an additional 5–7 minutes or until the topping turns golden brown.
Step 11: Serve
Garnish with fresh parsley before serving immediately. Enjoy your delicious Zucchini & Squash Casserole!
How to Serve Zucchini & Squash Casserole
This Zucchini and Squash Casserole is versatile and can be enjoyed in various ways. Whether as a standalone dish or paired with other favorites, here are some delightful serving suggestions.
As a Side Dish
- Perfect alongside grilled meats like chicken or steak for a balanced meal.
- Complements roasted vegetables, adding freshness to your plate.
In a Salad
- Chop leftovers into salads for a burst of flavor and texture.
- Mix with greens, cherry tomatoes, and a light vinaigrette for a refreshing summer salad.
With Bread
- Serve with crusty bread or garlic bread to soak up the casserole’s delicious juices.
- Pair with a side of buttered rolls for an extra treat at your dinner table.
As a Main Dish
- Top with a fried egg for a hearty brunch option.
- Add cooked quinoa or rice beneath the casserole to create a filling main dish.
How to Perfect Zucchini & Squash Casserole
To ensure your Zucchini and Squash Casserole turns out perfectly every time, follow these helpful tips.
- Choose fresh squash: Select firm zucchini and yellow squash for the best flavor and texture.
- Slice evenly: Cut the squash into uniform ¼-inch slices to ensure even cooking throughout.
- Drain excess moisture: Allow the sliced squash to sit with salt before cooking, which helps remove excess water and prevents sogginess.
- Use high-quality cheese: Opt for freshly grated Parmesan cheese instead of pre-packaged for better melting and flavor.
- Adjust seasoning: Feel free to customize the salt, pepper, and garlic powder levels according to your taste preferences.
- Broil carefully: Watch closely while broiling to avoid burning the topping; it should turn perfectly golden brown.
Best Side Dishes for Zucchini & Squash Casserole
Pairing side dishes with your Zucchini and Squash Casserole can elevate your meal. Here are some excellent options that work well together.
- Grilled Chicken: Juicy grilled chicken breast adds protein and complements the lightness of the casserole.
- Roasted Potatoes: Crispy roasted potatoes provide a hearty companion that balances flavors beautifully.
- Steamed Green Beans: Fresh green beans add crunch and color, making your plate more appealing.
- Quinoa Salad: A light quinoa salad with herbs offers a nutty flavor that pairs nicely with the dish’s richness.
- Garlic Bread: Warm garlic bread is perfect for scooping up the casserole’s cheesy goodness.
- Caesar Salad: A classic Caesar salad brings crisp romaine lettuce and creamy dressing for contrast against the casserole’s softness.
- Coleslaw: Tangy coleslaw provides freshness that enhances the overall dining experience.
- Corn on the Cob: Sweet corn adds seasonal flair, especially during summer gatherings.
Common Mistakes to Avoid
When making Zucchini & Squash Casserole, it’s easy to overlook a few key details. Here are some common mistakes to avoid for the best results.
- Boldly skip salting: Not salting the zucchini and squash can lead to excess moisture in your casserole. Always sprinkle salt and let it sit before cooking.
- Boldly overcrowding the dish: Placing too many slices in the baking dish can prevent even cooking. Ensure slices are arranged in a single layer or slightly overlapping.
- Boldly ignoring the broil step: Skipping the broiling phase means missing out on that beautiful golden topping. Always finish with a quick broil for a crispy texture.
- Boldly using stale breadcrumbs: Using old or stale breadcrumbs can affect flavor and texture. Make sure your Panko is fresh for optimal crunch.
- Boldly neglecting garnishes: Forgetting fresh parsley can leave your casserole looking dull. Always top with fresh herbs just before serving for color and flavor.

Storage & Reheating Instructions
Refrigerator Storage
- Store leftovers in an airtight container.
- Consume within 3-4 days for best flavor.
Freezing Zucchini & Squash Casserole
- Let the casserole cool completely before freezing.
- Store in freezer-safe containers or wrap tightly in plastic wrap and foil.
- Consume within 2-3 months for best quality.
Reheating Zucchini & Squash Casserole
- Oven: Preheat to 350°F and reheat covered for about 15-20 minutes until warm throughout.
- Microwave: Heat individual portions on medium power for 1-2 minutes, checking frequently.
- Stovetop: Place in a skillet over low heat, stirring occasionally until heated through.
Frequently Asked Questions
What can I serve with Zucchini & Squash Casserole?
This versatile casserole pairs well with grilled meats, salads, or even as a filling vegetarian main dish.
Can I use different types of squash?
Absolutely! Feel free to mix in other summer squashes like pattypan or even add bell peppers for extra flavor.
How do I make this casserole gluten-free?
Simply use gluten-free Panko breadcrumbs, which will keep the dish light and crunchy without gluten.
Can I prepare Zucchini & Squash Casserole ahead of time?
Yes! You can assemble the casserole a day in advance, cover it, and store it in the refrigerator until you’re ready to bake.
Is this recipe suitable for meal prep?
Definitely! This casserole stores well and reheats easily, making it perfect for meal prep throughout the week.
Final Thoughts
Zucchini & Squash Casserole is not only healthy but also incredibly delicious and adaptable. You can customize it based on what you have at home or your taste preferences. Try adding spices or different cheeses to make it uniquely yours!
Zucchini & Squash Casserole
Zucchini & Squash Casserole is a delicious and healthy dish that celebrates the vibrant flavors of summer squash. This easy-to-make casserole combines fresh zucchini and yellow squash with a crispy Panko and Parmesan topping, creating an irresistible side dish perfect for potlucks, summer picnics, or family dinners. Simple yet flavorful, this versatile recipe caters to various dietary needs with a gluten-free option, ensuring everyone can enjoy it. A delightful medley of textures makes this casserole a standout choice for any meal!
- Prep Time: 15 minutes
- Cook Time: 40 minutes
- Total Time: 55 minutes
- Yield: approximately 6 servings 1x
- 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
- 2 Tbsp. fresh parsley (finely chopped)
Instructions
- Preheat your oven to 350°F.
- Slice zucchini and yellow squash into thin, ¼-inch pieces.
- Sprinkle with ½ teaspoon salt and let sit for 10 minutes to draw out moisture; pat dry.
- Spray a 9-inch square baking dish with non-stick spray.
- Layer the zucchini and squash in overlapping rows in the dish.
- Drizzle olive oil over the vegetables and season with remaining salt and pepper.
- In a bowl, mix Parmesan cheese, Panko breadcrumbs, and garlic powder; sprinkle over the veggies.
- Cover with foil and bake for 30 minutes; remove foil and broil for an additional 5–7 minutes until golden brown.
- Garnish with fresh parsley before serving.
Nutrition
- Serving Size: 1 serving
- Calories: 150
- Sugar: 3g
- Sodium: 400mg
- Fat: 8g
- Saturated Fat: 2g
- Unsaturated Fat: 6g
- Trans Fat: 0g
- Carbohydrates: 15g
- Fiber: 3g
- Protein: 5g
- Cholesterol: 10mg