Zucchini Au Gratin is the perfect blend of comfort and freshness. Thinly sliced zucchini, baked until tender with a golden, cheesy topping. It’s creamy, crispy, and packed with flavor in every bite—a simple yet satisfying side dish!
Preheat your oven to 400°F (200°C). Grease a 9x13" baking dish with butter or nonstick spray.
Melt 4 tablespoons of butter in a large saucepan. Add minced garlic and diced onion, until onion is translucent. Combine zucchini into the pan for about 10-15 minutes, or until tender.
Mix in salt, pepper, and parmesan cheese. Cook for 5 minutes.
In a small bowl or measuring cup, whisk flour into heavy cream/milk until smooth. Add to the zucchini in the saucepan, heat to bubbling. Cook on low until thickened.
Pour the zucchini mixture into prepared baking dish. Sprinkle shredded cheese over the top. Bake 12-15 minutes in the preheated oven. Allow to rest 5-10 minutes before serving. Enjoy!