Question: how do you heat up fully cooked bacon?
Answer: In the oven: If you have the time, preheat your oven to 375ºF and line a baking sheet with foil. Place the bacon on the foil in a single layer and cook for about 5 minutes. If you didn't overcook your bacon before putting it in the fridge or freezer, it won't overcook now but be hot and crispy.