Step 1, Preheat the oven or broiler. You can bake or broil any variety of pepper, but usually, large bell peppers should be roasted in an oven preheated to 425 degrees Fahrenheit (218 degrees Celsius) while smaller peppers should be roasted in broiler that has been preheated for 5 to 10 minutes.[1] Either way, prepare a baking sheet by lining it with aluminum foil. If you are using a broiler with ...Step 2, Cut the peppers or leave them whole. Small peppers should be left whole ...