Preheat the oven to 375°F, and line a baking sheet with parchment paper. Lay the uncooked bacon slices on the pan. Then combine the brown sugar, pepper, cayenne and pepper flakes, and stir to combine.
Sprinkle the sugar mixture over the bacon, fully coating every slice. Put the sugar down so it's well worked in.
Bake for 30-40 minutes, or until the bacon is browned and crispy. Remove, and let cool for 10 minutes. Then transfer to a cooling rack and let cool another 10 minutes.