To cook bacon in the oven, preheat the oven to 400°F (200°C) . Then, line a baking sheet with parchment paper or aluminum foil for easy cleanup. Arrange the bacon slices in a single layer on the baking sheet, making sure they dont touch. Cook the bacon for 10 to 20 minutes, depending on how crispy you like it. The exact cooking time will depend on the thickness of the bacon, so its best to check it after 10 minutes and then keep an eye on it until its done to your liking. Once the bacon is cooked, remove it from the oven and transfer it to a paper towel-lined plate to absorb any excess grease.