Easy Zucchini Potato Gratin Recipe

Delicious and easy to make, no cream zucchini potato gratin is a perfect vegetable bake to use up fresh garden vegetables in the summer. Serve it warm or lukewarm.

updated from 2012

ZUCCHINI POTATO GRATIN RECIPE

WHAT YOU NEED TO MAKE VEGETABLE GRATIN

• Zucchini
• Potatoes
• Ricotta Cheese
• Sour Cream or Greek Yogurt
• Eggs
• Parmesan
• Mozzarella
• Salt
• Pepper
• Chives
• Garlic

ZUCCHINI AND POTATOES

Scrub the zucchini and potatoes. The fastest way to slice the veggies thinly is with a mandoline slicer. Yes, you can use a knife, but a mandoline slicer gives consistent results fast.

Be sure to use the protector sleeve to slice zucchini to 2/16 inch or little less than 1/4 inch and slice potatoes to about 1/16 inch thick.

To avoid having watery baked zucchini potato gratin, it is essential that you don’t skip this next step. Generously salt zucchini and potatoes with salt. I used about two teaspoons of pink salt. Toss vegetables and put them into a large colander to drain while you prepare the cheese filling and preheat the oven, about 15-20 minutes.

CHEESY GRATIN FILLING

Combine ricotta, sour cream or Greek Yogurt, chopped chives, pressed garlic, parmesan and mozzarella cheese, ground black pepper, and eggs in another bowl.

LAYER ZUCCHINI POTATO GRATIN

If you have a 9×13 inch casserole dish, you can vertically layer sliced zucchini and potatoes. If you have a 9-inch round casserole baking dish, layer about 1/3 of drained zucchini and potato slices, then spread 1/3 of the cheese filling over the vegetable layer (steps 1-2). Repeat until you finish all the vegetables and cheese filling (steps 3-6).

BAKE ZUCCHINI POTATO GRATIN

Bake 375F (190C), uncovered for 60 minutes, or until potatoes are cooked.

MORE DELICIOUS RECIPES

• Stuffed Peppers with Ground Pork and Rice
• My Favorite Tomato Soup Recipe, great for eating and canning
• Roasted Egg Plant via Wholesome Yum
• Honey Glazed Balsamic Roasted Carrots
• Stuffed Cabbage Casserole

BAKING SUCCESS TIPS

• Make sure to salt zucchini and potatoes to avoid watery baked casserole. Generously season sliced vegetables with salt, place them into a large colander and let stand for 15 minutes to drain.
• I don’t use salt in the filling. Remember, parmesan in the filling is salty, and vegetables retain some of the salt even after draining. You don’t need to add more salt at this point.
• It’s perfectly fine to bake this vegetable gratin a day ahead. Store it in the fridge and reheat before serving.
• In the heat of the summer, I love eating it lukewarm.
• What to serve with the gratin? You can enjoy it plain, with tomatoes, green salad, chicken or other meats.
• If you don’t have mozzarella cheese, you can up the parmesan cheese, or use a different shredded cheese.

This recipe was first published on July 24, 2012. On July 27, 2023 I updated this recipe with new photos, step by step instructions and a recipe card.