How many servings does this recipe make?

This recipe makes 4 servings. You can adjust the portion size directly on this page.

What ingredients do I need for Easy Cheesy Zucchini Gratin?

You need 11 ingredients. The key ingredients include: 3 -5 tablespoons unsalted butter, plus extra for topping (start with 3, then see how much more you want to put in), 2 yellow onions, cut in 1/2 and sliced, 2 -4 garlic cloves, minced (optional), 2 lbs zucchini, sliced 1/4-inch thick (about 4 zucchini), and more.

Is Easy Cheesy Zucchini Gratin suitable as vegetarian?

Yes, Easy Cheesy Zucchini Gratin falls under the Vegetarian category and is a great choice for this type of meal.

How do I store leftover Easy Cheesy Zucchini Gratin?

Store leftovers in an airtight container in the refrigerator for up to 3–4 days. Reheat gently before serving.

Easy Cheesy Zucchini Gratin Recipe

Name: Easy Cheesy Zucchini Gratin
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 3 -5 tablespoons unsalted butter, plus extra for topping (start with 3, then see how much more you want to put in); 2 yellow onions, cut in 1/2 and sliced; 2 -4 garlic cloves, minced (optional); 2 lbs zucchini, sliced 1/4-inch thick (about 4 zucchini); 1 -2 teaspoon kosher salt (or sea salt to taste); 1 teaspoon fresh ground black pepper; 1/4 teaspoon ground nutmeg; 2 tablespoons all-purpose flour; 1 cup hot milk; 3/4 - 1 cup panko breadcrumbs (or Italian breadcrumbs); 3/4 cup grated gruyere cheese (or Gouda, cheddar, Swiss or Parmesan)

Try this homemade Easy Cheesy Zucchini Gratin recipe the whole family will love. Made with unsalted butter, yellow onions, zucchini and kosher salt. Eas…

This Easy Cheesy Zucchini Gratin relies on simple, everyday ingredients such as fresh ground black pepper, ground nutmeg, all-purpose flour and hot milk. It comes together quickly and makes 4 servings, at about 895 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.

It's versatile enough for an easy weeknight dinner yet satisfying enough for guests at the weekend. Serve it with your favorite sides, and keep any leftovers for a quick meal the next day.

Updated Jun 30, 2026

Serves 4 Vegetarian

Tips for the best results

Read through all the steps once before you start and measure out your ingredients first — it makes everything go more smoothly.
Taste as you go and adjust the seasoning before serving.
Avoid overcrowding the pan — cook in batches if needed for the best texture.
Let the dish rest for a few minutes before serving so the flavors settle.
Store leftovers in an airtight container in the fridge and enjoy within a few days.

Variations & substitutions

Use a neutral oil or a plant-based spread in place of butter for a dairy-free version.
A good 1:1 gluten-free flour blend works well if you need a gluten-free version.

No specific allergen information. Please check the ingredient list for possible allergens.

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Easy Cheesy Zucchini Gratin

Tips for the best results

Variations & substitutions

My Personal Notes

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