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 Squash-and-Onion Gratin?

You need 7 ingredients. The key ingredients include: 5 pounds zucchini, or a mix of zucchini and yellow squash, cut into 1/2-inch slices, 4 large onions, thinly sliced, 1 1/2 cups grated Gruyere cheese (6 ounces), 1 cup ricotta cheese, and more.

Is Squash-and-Onion Gratin suitable as vegetarian?

Yes, Squash-and-Onion Gratin falls under the Vegetarian category and is a great choice for this type of meal.

How do I store leftover Squash-and-Onion Gratin?

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

Squash-and-Onion Gratin Recipe

Name: Squash-and-Onion Gratin
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 5 pounds zucchini, or a mix of zucchini and yellow squash, cut into 1/2-inch slices; 4 large onions, thinly sliced; 1 1/2 cups grated Gruyere cheese (6 ounces); 1 cup ricotta cheese; 2 large garlic cloves, minced; 1 1/2 teaspoons salt; Freshly ground black pepper

Try this homemade Squash-and-Onion Gratin recipe the whole family will love. Made with zucchini, onions, Gruyere cheese and ricotta cheese. Easy step-by…

This Squash-and-Onion Gratin relies on simple, everyday ingredients such as large onions, thinly sliced, ricotta cheese, large garlic cloves, minced and salt. It comes together quickly and makes 4 servings, at about 486 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

Servings: persons

5 pounds zucchini, or a mix of zucchini and yellow squash, cut into 1/2-inch slices
4 large onions, thinly sliced
1 1/2 cups grated Gruyere cheese (6 ounces)
1 cup ricotta cheese
2 large garlic cloves, minced
1 1/2 teaspoons salt
Freshly ground black pepper

Frequently Asked Questions

Quick Info

Servings
4 servings
Calories
486 kcal
Category
Vegetarian

Eats Now Editorial Team

Recipe developed & tested in-house

Passionate cooks who develop and test new recipes every day – from quick weeknight dinners to special occasion feasts.

Reviewed by the Eats Now Kitchen Team

More about our team →

Squash-and-Onion Gratin

Tips for the best results

Variations & substitutions

My Personal Notes

How did you like this recipe?

Frequently Asked Questions