1-First Step: Get the crust ready Preheat your oven to 350°F. If you are using refrigerated pie dough, let it sit at room temperature for a few minutes so it becomes easier to roll. Roll the dough into a 12-inch circle, then place it into a 9-inch pie dish. Trim the edges and crimp them for a neat finish. Prick the bottom of the crust with a fork, then set the pie dish on a small baking sheet so it is easier to move in and out of the oven. Par-bake the crust for 10 to 15 minutes. This step matters because it helps the bottom stay crisp once the filling goes in. Without it, the crust can turn soft from the moisture in the zucchini and eggs. If you are short on time, a frozen pie crust can work too. Just follow the package directions before filling.

2-Second Step: Cook the zucchini mixture While the crust bakes, heat 1 tablespoon olive oil in a skillet over medium heat. Add the diced red onion and minced garlic. Cook for about 30 seconds, just until fragrant. Then add the sliced zucchini, 1 teaspoon salt, and a little pepper. Cook the vegetables for 7 to 8 minutes, stirring now and then, until the zucchini softens. This is an important step in any zucchini quiche or quiche recipe because zucchini holds a lot of water. Cooking it first helps keep the filling from turning watery and protects the crust from getting soggy. The vegetables should look tender but not mushy.

3-Third Step: Make the egg and cheese filling In a mixing bowl, whisk together 6 eggs, 1/2 cup skim milk, 1/2 cup part-skim ricotta cheese, 1/2 cup part-skim shredded mozzarella cheese, 2 tablespoons of the grated Parmesan, the chopped basil, and more salt and pepper to taste. Whisk until the mixture looks smooth and well blended. This custard gives the zucchini quiche its soft, creamy center. The ricotta adds body, the mozzarella melts gently, and the Parmesan adds a savory finish. If you want a slightly stronger flavor, you can add a little extra pepper or a pinch of dried herbs.

4-Fourth Step: Assemble the quiche Once the crust is par-baked, add most of the cooked zucchini mixture to the crust. Spread it out evenly so every slice gets plenty of vegetables. Then pour the egg mixture over the zucchini. Top with the remaining zucchini and sprinkle the last 2 tablespoons of Parmesan over the top. Cover the crust edges with foil to prevent burning. This is a simple trick, but it makes a big difference, especially if your oven runs hot or your crust browns quickly. At this stage, the quiche should look full but not overflowing.

5-Fifth Step: Bake until set Bake the zucchini quiche for 50 minutes to 1 hour at 350°F, or until the center is set and the top is nicely browned. The middle should no longer look loose or wet. If you gently shake the pan, the center should have just a slight wobble, not a slosh. If the top starts browning too fast, leave the foil on the edges a little longer. Every oven is a bit different, so keep an eye on it during the final 10 minutes. The goal is a baked filling that holds together well when sliced.

6-Final Step: Cool, slice, and serve Let the quiche cool for 10 minutes before cutting. This short resting time helps the filling firm up so you get cleaner slices. Garnish with extra basil, then serve in 6 slices. It tastes great warm, and it also works well at room temperature. For a full meal, pair this easy crustless zucchini quiche style dish or crusted version with fruit, toast, or a simple salad. If you want another fresh side dish idea for brunch, try a bright salad like Mexican street corn salad or a lighter vegetable side from summer squash corn chowder inspiration.