Cheddar is high in fat and calories, so limit to 2 tablespoons for each sandwich. For variety, use roast beef that has been rubbed with Italian seasonings.
Heat the oven to 350 F. Lightly coat a baking pan with cooking spray. Spray a frying pan with cooking spray.
Over medium heat, saute the peppers and onions until they soften, 3 to 5 minutes. Add the roast beef and saute for an additional 2 to 3 minutes.
Place 1/2 of the roast beef mixture on the bottom half of each bun. Place in the prepared baking dish. Top each bun with 2 tablespoons of the cheese. Bake until the cheese has melted, 2 to 4 minutes. Remove and add the top of bun and serve.
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