Prepare the Pie Crust: If using a store-bought pie crust, roll it out and place it into a 9-inch pie pan. If you prefer homemade, prepare your crust as needed, then fit it into the pan.
Cook the Bacon: In a skillet, cook your bacon over medium heat until crispy. Drain on paper towels and crumble into small pieces once cooled.
Mix the Filling: In a large bowl, whisk together the eggs and milk. Season with salt and pepper. Stir in the crumbled bacon, chopped green onions, and shredded cheese until evenly combined.
Pour and Bake: Pour the filling mixture into the prepared pie crust. Bake in the preheated oven for 35-40 minutes or until the quiche is set and the top is golden.
Cool: Once done, remove it from the oven and allow it to cool for a few minutes before slicing.
Serve: Enjoy warm or at room temperature.