Healthy, simple, and fabulous, this Zucchini & Squash Casserole is the best healthy recipe for summer squash. This easy casserole shines at summer picnics and potlucks, making it the perfect side dish for any holiday dinner. With its delightful blend of flavors and textures, itβs sure to impress your guests while keeping things light and nutritious.
Why Youβll Love This Recipe
- Quick Preparation: This casserole comes together in just 15 minutes of prep time, making it a hassle-free choice for busy cooks.
- Versatile Dish: Perfect for summer gatherings or holiday feasts, this dish can complement a variety of meals.
- Healthy Ingredients: Packed with fresh summer squash and minimal added fats, itβs a guilt-free indulgence.
- Deliciously Flavorful: The combination of Parmesan cheese and garlic powder elevates the dishβs flavor profile.
- Gluten-Free Option: Thanks to gluten-free Panko breadcrumbs, this casserole can be enjoyed by everyone.
Tools and Preparation
To make your Zucchini & Squash Casserole, youβll need some essential tools that will simplify the cooking process.
Essential Tools and Equipment
- Non-stick baking dish
- Sharp knife
- Cutting board
- Mixing bowl
- Aluminum foil
Importance of Each Tool
- Non-stick baking dish: Prevents sticking and allows for easy removal of the casserole.
- Sharp knife: Ensures clean cuts on the zucchini and squash for even cooking.
- Mixing bowl: Ideal for combining ingredients without mess.
Ingredients
- 2 lbs. summer squash (zucchini and yellow squash, cut into ΒΌ-inch slices)
- 2 Β½ Tbsp. olive oil
- 1 ΒΌ tsp. salt (divided)
- Β½ tsp. pepper
- β cup Parmesan cheese (grated)
- β cup Panko breadcrumbs (gluten-free)
- ΒΌ tsp. garlic powder
- 2 Tbsp. fresh parsley (finely chopped)
For Garnish
- 2 tablespoons fresh parsley, finely chopped
How to Make Zucchini & Squash Casserole
Step 1: Preheat the Oven
Preheat your oven to 350 degrees Fahrenheit to prepare for baking the casserole.
Step 2: Prepare the Vegetables
- Cut the yellow squash and zucchini into thin, ΒΌ-inch slices.
- Sprinkle Β½ teaspoon salt over the sliced vegetables.
- Let them sit for about 10 minutes to draw out excess moisture, then dab them dry with a paper towel.
Step 3: Assemble in Baking Dish
- Spray a non-stick cooking spray in a 9-inch square baking dish.
- Arrange the zucchini and squash slices in overlapping rows; aim for four rows if possible.
Step 4: Add Seasonings
- Drizzle olive oil over the layered zucchini and squash.
- Sprinkle remaining salt and pepper evenly across the top.
Step 5: Combine Toppings
- In a small mixing bowl, combine Parmesan cheese, Panko breadcrumbs, and garlic powder.
- Toss well to mix all ingredients before sprinkling over the layered vegetables.
Step 6: Bake
- Cover the baking dish tightly with aluminum foil.
- Bake in your preheated oven for about 30 minutes.
Step 7: Broil for Crispiness
- Remove the foil after baking time is complete.
- Turn your oven to high broil setting.
- Broil for an additional 5β7 minutes or until the breadcrumb topping turns golden brown.
Step 8: Serve
Garnish with fresh parsley before serving warm. Enjoy your delicious Zucchini & Squash Casserole!
How to Serve Zucchini & Squash Casserole
Zucchini and Squash Casserole is a versatile dish that can enhance any meal. It pairs well with various foods, making it an excellent choice for gatherings or family dinners.
As a Side Dish
- With Grilled Meats: This casserole complements grilled chicken or beef, adding a healthy veggie option.
- Alongside Fish: The light flavors of zucchini and squash work beautifully with baked or grilled fish.
- In a Vegetarian Feast: Serve it as part of a vegetarian platter with quinoa or lentil salad for a wholesome meal.
For Potlucks
- In Individual Portions: Spoon the casserole into small ramekins for easy serving at potlucks.
- As Part of a Buffet: Place it on a buffet table next to other dishes like pasta or salads for variety.
With Fresh Herbs
- Garnished with Parsley: Sprinkle fresh parsley on top before serving for a pop of color and added freshness.
- Drizzled with Balsamic Glaze: A light balsamic drizzle adds a tangy kick that enhances the flavors.
How to Perfect Zucchini & Squash Casserole
To ensure your Zucchini and Squash Casserole turns out perfectly every time, consider these helpful tips:
- Bold Slice Evenly: Make sure to slice the zucchini and squash uniformly to promote even cooking.
- Bold Pat Dry: After salting, always pat the vegetables dry to avoid excess moisture in your casserole.
- Bold Customize Cheese: Feel free to experiment with different cheeses like mozzarella or cheddar for varied flavors.
- Bold Watch Broiling Time: Keep an eye on the casserole while broiling; it can brown quickly!
- Bold Add More Veggies: Consider adding bell peppers or onions for extra flavor and nutrition.
- Bold Let It Rest: Allow the casserole to sit for 5 minutes after baking; this helps it set and makes serving easier.

Best Side Dishes for Zucchini & Squash Casserole
Pairing side dishes with Zucchini and Squash Casserole can elevate your meal. Here are some delicious options:
- Garlic Bread: A classic choice that complements the flavors of the casserole while adding crunch.
- Mixed Green Salad: A fresh salad brings brightness and balances the richness of the casserole.
- Roasted Potatoes: Crispy roasted potatoes provide a hearty element alongside the soft texture of the casserole.
- Coleslaw: The crunchiness of coleslaw adds texture and freshness, perfect for summer meals.
- Corn on the Cob: Sweet corn pairs wonderfully, enhancing the summer vibe of this dish.
- Steamed Broccoli: Lightly steamed broccoli offers additional veggies and nutrition without overpowering flavors.
Common Mistakes to Avoid
When making Zucchini & Squash Casserole, itβs easy to make some common mistakes that can affect the final dish. Here are a few to watch out for:
Overcrowding the Baking Dish: If you pack too many zucchini and squash slices into the dish, they wonβt cook evenly. Ensure thereβs enough space for air to circulate around the vegetables.
Skipping Salting Step: Neglecting to sprinkle salt on the zucchini and squash before baking can lead to a watery casserole. Always let the slices sit with salt to draw out moisture.
Not Preheating the Oven: Failing to preheat your oven can result in uneven cooking. Make sure your oven reaches 350 degrees Fahrenheit before placing your casserole inside.
Using Low-Quality Ingredients: Using subpar cheese or old ingredients can diminish the flavor of your casserole. Opt for fresh, high-quality ingredients for the best taste.
Ignoring Broiling Time: Overlooking the broiling step at the end can leave your casserole lacking that delicious golden-brown topping. Keep an eye on it while broiling to prevent burning.
Storage & Reheating Instructions
Refrigerator Storage
- Store leftovers in an airtight container.
- Consume within 3β5 days for optimal freshness.
- Allow the casserole to cool completely before refrigerating.
Freezing Zucchini & Squash Casserole
- Wrap tightly in plastic wrap or use freezer-safe containers.
- Can be frozen for up to 2β3 months.
- Thaw overnight in the refrigerator before reheating.
Reheating Zucchini & Squash Casserole
- Oven: Preheat to 350 degrees Fahrenheit and bake for about 15-20 minutes until heated through.
- Microwave: Heat in 1-minute intervals until warmed evenly, stirring between sessions.
- Stovetop: Warm gently over low heat, stirring occasionally until hot; add a splash of olive oil if needed.

Frequently Asked Questions
What is Zucchini & Squash Casserole?
Zucchini & Squash Casserole is a healthy side dish made from layered zucchini and yellow squash, baked with cheese and breadcrumbs for a delicious flavor.
Can I use other vegetables in this casserole?
Yes! Feel free to add vegetables like bell peppers or tomatoes for added flavor and nutrition.
How can I make this Zucchini & Squash Casserole gluten-free?
Use gluten-free Panko bread crumbs as specified in the recipe, and ensure all other ingredients are gluten-free as well.
What dishes pair well with Zucchini & Squash Casserole?
This casserole pairs nicely with grilled meats, pasta dishes, or can be served as part of a vegetarian meal.
Is this recipe suitable for meal prep?
Absolutely! Zucchini & Squash Casserole is perfect for meal prep and can be stored in individual portions for easy reheating during busy weeks.
Final Thoughts
Zucchini & Squash Casserole is not only healthy but also versatile, making it a great addition to any table. You can customize it with different spices or vegetables according to your taste preferences. Give this simple yet fabulous recipe a try; you wonβt be disappointed!

Zucchini & Squash Casserole
- Author: Adeline
- Total Time: 50 minutes
- Yield: Serves approximately 6 people 1x
Description
Zucchini & Squash Casserole is a delightful summer dish that combines the fresh flavors of zucchini and yellow squash, creating a light and nutritious side that is perfect for any occasion.
Ingredients
- 2 lbs summer squash (zucchini and yellow squash)
- 2 Β½ Tbsp olive oil
- 1 ΒΌ tsp salt
- Β½ tsp pepper
- β cup Parmesan cheese (grated)
- β cup gluten-free Panko breadcrumbs
- ΒΌ tsp garlic powder
- 2 Tbsp fresh parsley (finely chopped)
Instructions
- Preheat oven to 350Β°F.
- Slice zucchini and yellow squash into ΒΌ-inch rounds. Sprinkle with salt and let sit for 10 minutes to draw out moisture; pat dry.
- Grease a non-stick baking dish. Layer the squash slices in overlapping rows.
- Drizzle olive oil over the layered vegetables, then sprinkle with remaining salt and pepper.
- In a bowl, mix Parmesan cheese, Panko breadcrumbs, and garlic powder; sprinkle over the top of the casserole.
- Cover with aluminum foil and bake for 30 minutes.
- Remove foil, switch to broil setting, and broil for an additional 5β7 minutes until toppings are golden brown.
- Garnish with fresh parsley before serving warm.
- Prep Time: 15 minutes
- Cook Time: 35 minutes
- Category: Side Dish
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 cup (150g)
- Calories: 160
- Sugar: 4g
- Sodium: 480mg
- Fat: 9g
- Saturated Fat: 2g
- Unsaturated Fat: 7g
- Trans Fat: 0g
- Carbohydrates: 16g
- Fiber: 3g
- Protein: 4g
- Cholesterol: 5mg
Keywords: For added flavor, consider incorporating bell peppers or onions into the layers. Adjust cooking times based on your ovenβs performance; keep an eye on the broiling process to avoid burning.