If you’re searching for a delicious way to enjoy summer vegetables, look no further than this Zucchini and Yellow Squash Au Gratin. This dish combines savory squash with creamy cheese and a crunchy topping that’s irresistible. From family dinners to summer gatherings, this recipe shines on any table, making it a perfect choice for a hearty, satisfying side dish. With every bite, you’ll savor the flavor and texture that will make you want to come back for more.
Why You’ll Love This Recipe
There are countless reasons to love this Zucchini and Yellow Squash Au Gratin! First and foremost, it’s incredibly delicious. The combination of fresh zucchini and yellow squash, paired with rich cheeses, creates a flavor explosion that’s hard to beat. The crispy topping adds a delightful crunch, while the creamy base provides a satisfying mouthfeel.
Not only is it scrumptious, but this dish is also a fantastic way to sneak more vegetables into your diet. With summer squash being abundant in gardens and farmers’ markets, this recipe makes the best use of them. It’s a great way to transform simple ingredients into something extraordinary.
Moreover, this au gratin is simple to prepare. With straightforward steps and common ingredients, you can whip this up even on a busy weeknight. Plus, it’s a crowd-pleaser! Whether you’re hosting a barbecue or simply enjoying a family meal, this dish is sure to impress your guests.
Ingredients You’ll Need
Before you can enjoy this delicious au gratin, you’ll need to gather the right ingredients. Here’s what you’ll need:
- 3 medium zucchinis, thinly sliced
- 3 medium yellow squashes, thinly sliced
- 1 medium onion, diced
- 2 cloves garlic, minced
- 2 cups shredded sharp cheddar cheese
- 1 cup grated Parmesan cheese
- 1 cup heavy cream
- 2 tablespoons unsalted butter
- 1 teaspoon salt
- 1/2 teaspoon black pepper
- 1/2 teaspoon dried oregano
- 1/2 teaspoon paprika
- 1 cup breadcrumbs (panko is best for extra crunch)
- Fresh parsley, chopped (for garnish)

Step-by-Step Instructions
Ready to create your own Zucchini and Yellow Squash Au Gratin? Follow these simple steps for a mouth-watering experience.
1. Preheat the Oven
Start by preheating your oven to 375°F (190°C). This ensures that your dish cooks evenly and thoroughly.
2. Prepare the Vegetables
Wash and slice the zucchinis and yellow squashes into thin, even circles. The thinner the slices, the quicker they will cook.
3. Sauté the Onion and Garlic
In a large skillet over medium heat, melt the butter. Add the diced onion and sauté until it’s translucent, about 5 minutes. Then, stir in the minced garlic and cook for another minute until fragrant.
4. Layer the Vegetables
In a greased baking dish, start layering the sliced zucchini and yellow squash. Add the sautéed onion and garlic evenly over the vegetables, then sprinkle with salt, pepper, oregano, and paprika. Toss the mixture gently to combine the seasonings evenly.
5. Add the Cheese and Cream
Pour the heavy cream over the layered vegetables, ensuring everything is evenly coated. Then sprinkle half of the shredded cheddar cheese and half of the grated Parmesan on top of the vegetable layer.
6. Add More Layers
Once the first layer is complete, add another layer of zucchini and yellow squash. Top this layer with the remaining cheeses, followed by the breadcrumbs. For an extra crispy topping, you can drizzle a bit of melted butter over the breadcrumbs before baking.
7. Baking Time
Place your dish in the preheated oven and bake for 30-35 minutes, or until the top is golden brown and the vegetables are tender. You’ll want to keep an eye on it to ensure it doesn’t burn.
8. Garnish and Serve
Once done, remove the au gratin from the oven and let it sit for about 10 minutes to cool slightly. Garnish with freshly chopped parsley for a pop of color before serving.
Serving and Storage Tips
After crafting this delightful au gratin, you may be wondering how best to serve and store it.
Serving Suggestions
- Serve warm as a side dish alongside grilled meats or fish.
- Add a fresh garden salad for a wholesome meal.
- Pair with crusty bread to soak up the creamy goodness.
Storage Tips
If you have leftovers (which is rare because it’s so delicious!), store them in an airtight container in the refrigerator. The au gratin will keep for about 3-4 days. You can reheat it in the oven at 350°F (175°C) until warmed through. Alternatively, you can microwave individual servings, just be cautious not to overheat as it can make the cheese rubbery.

Helpful Tips
Here are some additional tips to help you get the most out of your Zucchini and Yellow Squash Au Gratin:
- Feel free to mix up the cheeses! Adding mozzarella or gouda can offer a twist to the flavor profile.
- Consider adding other vegetables like bell peppers or spinach for a heartier dish.
- If you like it spicy, a sprinkle of crushed red pepper flakes can add an exciting kick.
- To make it lighter, you can substitute half and half for the heavy cream and use less cheese.
Frequently Asked Questions (FAQ)
Can I use yellow squash instead of zucchini?
Absolutely! You can use either or both! Yellow squash and zucchini complement each other well, making for a colorful and flavorful dish.
Is it possible to make this dish ahead of time?
Yes, you can prepare the au gratin one day ahead. Just assemble it without baking, cover tightly with plastic wrap, and store it in the refrigerator. When ready to bake, simply take it out, allow it to come to room temperature, and then bake as directed.
Can I freeze the au gratin?
While it’s possible to freeze this dish, the texture might change slightly after thawing. If you plan to freeze it, do so before baking. Wrap it tightly in foil or plastic wrap and store in a freezer-safe container. When you’re ready to enjoy it, thaw overnight in the fridge and bake as usual.
What can I serve as a main course with this dish?
This au gratin pairs beautifully with grilled chicken, fish, or even a hearty pasta dish. It’s versatile enough to complement various proteins and can showcase any meal.
Are there any alternatives to breadcrumbs for the topping?
If you prefer a gluten-free option, you can use crushed gluten-free crackers or a blend of ground almonds. For a low-carb twist, skip the breadcrumbs altogether and use additional cheese for crunch.
Conclusion
This Zucchini and Yellow Squash Au Gratin is quite the culinary delight! Packed with flavor, texture, and nutrients, it’s an ideal dish for any occasion. Whether you’re looking to impress guests or simply enjoy a comforting meal at home, this recipe is sure to satisfy your cravings. Try it out, and you may just find it becomes a staple in your household! Don’t forget to share it with friends and family; good food is meant to be shared!
Print
Mouthwatering Zucchini Yellow Squash Au Gratin Recipe
- Total Time: 50 minutes
- Yield: 6 servings 1x
Description
Indulge in this mouthwatering Zucchini Yellow Squash Au Gratin recipe featuring creamy layers and a crispy topping Perfect for any meal
Ingredients
Instructions
- Prep Time: 15 minutes
- Cook Time: 35 minutes
- Category: Side Dish
- Cuisine: American
Nutrition
- Calories: 300 calories
- Sugar: 3 grams
- Fat: 24 grams
- Saturated Fat: 24 grams
- Carbohydrates: 18 grams
- Fiber: 3 grams
- Protein: 10 grams