Preheat oven to 350 degrees. Whisk eggs, milk, salt and pepper together in a large mixing bowl. Add the cheese, potatoes, green onions, and crumbled bacon and stir to combine. Lay the pie crust in the bottom of a 9 inch pie dish. Pour the egg mixture into the pie pan. Bake for 35-40 minutes or until the quiche is firm enough to lay the bacon on. Remove the pie and increase the temperature to 450 degrees. Weave the bacon into a lattice on top of the pie. Brush each strip of bacon with maple syrup. Cover the edges of the pie with aluminum foil to prevent burning. Note: The bacon will shrink a lot, so it is fine that the bacon is hanging over the sides. Return the pie to the oven and bake for 10-15 minutes or until the bacon is done. Tip dish carefully to drain any bacon grease. (If you like extra crispy bacon you could put the pie under the broiler for a couple of minutes, or until the bacon has reached your preferred doneness.)