spinach quiche recipe

Let's make a delicious spinach quiche! Ingredients: 1 store-bought or homemade pie crust 1 tablespoon olive oil 1 small onion, finely chopped 3 cloves garlic, minced 6 ounces fresh spinach, chopped 1 cup shredded cheese (such as Gruyère, cheddar, or Swiss) 1/2 cup crumbled feta cheese (optional) 4 large eggs