To cook bacon in the oven, preheat it to 400 degrees F, then spray a large baking sheet with nonstick cooking spray. Lay bacon strips in a single layer and bake in the preheated oven for about 15 minutes, then flip the slices over and cook for an additional 5-10 minutes or until crispy. Remove from the oven and transfer bacon to a wire cooling rack. To create bacon pieces, chop the completely cooled bacon into small pieces. Use immediately, or store in the fridge for up to 5 days.