Line a baking sheet with parchment paper and spray with cooking spray. Place the flatbreads on the lined baking sheet. Top each flatbread with cheese, making the edges higher than the middle (so your eggs don’t run off the sides too much). Top the cheese with the cooked bacon.
In a bowl, whisk the eggs, milk, garlic powder salt and pepper until well combined. Very slowly, pour half of the eggs over the cheese of each pizza. Some of the egg will run off. (Don’t freak out, it’s going to be okay.) Carefully place the pan of pizzas in the oven and bake for 15 minutes or until the egg is set.
Remove from the oven, slice and top with green onions.