Yes, you can definitely do this recipe in an oven. Simply preheat the oven to 400 degrees F and place the oiled peppers cut side down on a baking sheet. Roast for 10-15 minutes then flip sides and roast for an additional 10-15 minutes until they are cooked through with a nice char. You can also toast the bread in the oven at the end. Simply broil for a minute or two before serving.