Loaded Vegetarian Quiche

Step 1
Preheat the oven to 400 degrees F (200 degrees C).

Step 2
Bake pie crust in preheated oven until firm, about 8 minutes.

Step 3
Remove crust from the oven and set aside. Reduce oven to 350 degrees F (175 degrees C).

Step 4
Heat olive oil in a large skillet over medium heat. Add onion, bell pepper, mushrooms, and zucchini and cook, stirring, until softened, 5 to 7 minutes. Remove vegetables from skillet and set aside.

Step 5
Sprinkle tomato slices with flour and basil; cook in the skillet over medium heat for 1 minute per side. Set aside.

Step 6
Whisk eggs, milk, salt, and pepper together in a small bowl.

Step 7
Spread 1 cup cheese in the bottom of pie crust. Layer vegetable mixture over the cheese, then top with tomato slices. Pour egg mixture over top and sprinkle with remaining 1/2 cup cheese.

Step 8
Bake in the preheated oven until a knife inserted near the center comes out clean, 40 to 45 minutes. Cool 5 minutes before serving.