Roll out your pie crust and gently place it in a 7-inch round or 8-inch square air fryer-safe pan. Press it into the sides, trimming any excess crust.
Cook the bacon in a skillet or air fryer until crispy. Once cooked, crumble it into small pieces.
In a mixing bowl, whisk together the eggs, heavy cream, salt, and black pepper until smooth and well combined.
Sprinkle the crumbled bacon evenly over the pie crust. Then, layer on the shredded Swiss and Gruyère cheeses.
Pour the egg mixture into the crust, ensuring it’s evenly distributed over the filling. If desired, sprinkle chopped green onions on top.
Preheat the air fryer to 320°F (160°C). Place the pan in the air fryer basket and cook for 20-25 minutes, or until the quiche is set in the center and lightly golden on top. (Check after 20 minutes to ensure it doesn't overcook.)
Let the quiche cool for a few minutes before slicing. Serve warm and enjoy your homemade Air Fryer La Madeleine Quiche Lorraine!