Easy Cheesy Zucchini Gratin
Easy cheesy zucchini gratin is a comforting, oven-baked dish that transforms simple zucchini into something rich and satisfying. Thinly sliced zucchini is layered with a creamy, seasoned sauce and plenty of melted cheese, then baked until golden and bubbling. The result is tender vegetables wrapped in a velvety texture with a lightly crisp top. It’s a great way to use up extra zucchini and works perfectly as a side dish or even a light main course. The balance of herbs, garlic, and cheese makes it both familiar and flavorful.
Preparation Time: 20 minutes
Cooking Time: 35 to 40 minutes
Total Time: About 1 hour
Ingredients
Core Ingredients
Zucchini: 4 to 5 medium, thinly sliced into rounds
Gruyère Cheese: 1 to 2 cups shredded
Parmesan Cheese: 1/2 cup freshly grated
Butter: 2 to 4 tablespoons
Onion or Shallots: 1 small onion or 2 large shallots, finely chopped
Garlic: 2 to 4 cloves, minced
Sauce and Seasoning
Whole Milk or Heavy Cream: 1 to 1.5 cups
All-Purpose Flour: 2 tablespoons
Italian Seasoning: 2 teaspoons
Fresh Thyme: 2 teaspoons, chopped
Nutmeg: a pinch (about 1/4 teaspoon)
Salt and Black Pepper: to taste
Optional Additions
Breadcrumbs or Crushed Crackers: 3/4 to 1 cup
Beef Broth: 1/4 cup
Fresh Chives or Parsley: chopped for garnish
Instructions
Preheat your oven to 180°C (350°F) and lightly grease a baking dish with butter.
In a skillet over medium heat, melt butter and sauté the chopped onion or shallots until soft and translucent. Add minced garlic and cook for another 30 seconds until fragrant.
Sprinkle in the flour and stir continuously for about 1 minute to form a light roux. Slowly pour in the milk or cream while whisking to avoid lumps. Continue cooking until the sauce thickens slightly.
Add Italian seasoning, fresh thyme, nutmeg, salt, and black pepper. Stir well and remove from heat.
Layer half of the sliced zucchini in the prepared baking dish. Pour some of the sauce over it and sprinkle a portion of the Gruyère cheese.
Repeat the layering process with the remaining zucchini, sauce, and cheese. Finish with a generous topping of Parmesan.
If using breadcrumbs, sprinkle them evenly over the top for a crispy finish.
Bake uncovered for 35 to 40 minutes, or until the top is golden and the zucchini is tender.
Let the gratin rest for about 10 minutes before serving. Garnish with fresh chives or parsley.
Tips
Slice zucchini evenly for consistent cooking
If zucchini is very watery, lightly salt and pat dry before using
Use a mandoline slicer for thin, uniform slices
Do not skip resting time as it helps the gratin set properly
Cook the sauce until slightly thick before layering
Use freshly grated cheese for better melting and flavor
Avoid overloading with liquid to prevent a watery dish
Bake uncovered for a golden, crispy top
Adjust cheese quantities based on preference
Let excess moisture evaporate during baking for better texture
Variations
Add cooked chicken or turkey for a protein-rich version
Use mozzarella or cheddar instead of Gruyère
Make it low-carb by skipping flour and using cream only
Add mushrooms or spinach for extra vegetables
Include crispy bacon bits for a smoky flavor
Use gluten-free flour and breadcrumbs if needed
Add chili flakes for a spicy kick
Mix in ricotta for a creamier texture
Top with crushed nuts for a unique crunch
Use vegetable broth instead of beef broth for a lighter option
Q&A
Can I make this dish ahead of time?
Yes, assemble it in advance and bake when ready.
Why is my gratin watery?
Zucchini releases water during cooking. Salting and drying helps reduce this.
Can I freeze it?
It can be frozen, but texture may become softer after reheating.
What cheese works best?
Gruyère is ideal, but mozzarella or cheddar also work well.
Can I skip breadcrumbs?
Yes, they are optional but add a nice crunch.
How long does it last in the fridge?
Up to 3 days in an airtight container.
Can I use cream instead of milk?
Yes, it makes the dish richer and thicker.
Do I need to peel zucchini?
No, the skin is tender and adds texture.
Can I make it vegetarian?
Yes, just skip beef broth or replace it with vegetable broth.
What can I serve it with?
It pairs well with grilled meats, pasta, or a fresh salad.
Nutrition
(Approximate per serving)
Calories: 280–350
Protein: 10–14g
Carbohydrates: 10–15g
Fat: 20–25g
Fiber: 2–3g
Sugar: 4–6g
Conclusion
Easy cheesy zucchini gratin is a reliable, comforting dish that turns simple ingredients into something rich and satisfying. The creamy sauce, melted cheese, and tender zucchini create a perfect balance of flavor and texture. It’s easy enough for everyday meals yet impressive enough to serve to guests. Once you try it, it quickly becomes a go-to recipe for using zucchini in a delicious way.