Bacon Onion Tomato Pie with Mozzarella Topping - Yummy Gusto

Ingredients

• 1 pre-baked deep 9-inch pie shell
• 6 to 8 thick-cut slices bacon, cooked crisp and chopped
• 2 medium tomatoes, thinly sliced
• 1 large yellow onion, very thinly sliced
• 1 1/2 cups shredded mozzarella cheese
• 1/2 cup mayonnaise
• 1/2 cup sour cream
• 1 tablespoon all-purpose flour
• 1/2 teaspoon garlic powder
• 1/4 teaspoon salt
• 1/4 teaspoon ground black pepper
• 1 tablespoon fresh parsley or chives, finely chopped (optional)