01 -
Set oven temperature to 350°F (175°C) and allow to fully preheat.
02 -
Place turkey bacon slices in a skillet over medium heat and cook until crisp. Remove and drain on paper towels; crumble once cooled.
03 -
In the same skillet, cook sliced onions over medium heat until softened and caramelized, approximately 10 minutes.
04 -
Combine mayonnaise, sour cream, all-purpose flour, salt, and black pepper in a small bowl. Stir until fully incorporated and smooth.
05 -
Arrange crumbled turkey bacon, sautéed onions, and sliced tomatoes evenly in the pre-baked pie crust. Sprinkle shredded cheddar and mozzarella cheese over the top. Spoon the cream mixture evenly over the surface.
06 -
Transfer assembled pie to the preheated oven and bake for 30 to 45 minutes, or until the surface is golden brown and the filling is set.
07 -
Allow pie to rest for at least 10 minutes before slicing and serving.