Cheddar is high in fat and calories, so limit to 2 tablespoons for each sandwich. For even more flavor, use roast beef that has been rubbed with Italian seasonings.
Preheat 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, about 3-5 minutes. Add the roast beef and saute for an additional 2-3 minutes.
Divide the roast beef mixture on the bottom half of each bun. Place in the prepared baking dish. Top each roast beef mixture with 2 tablespoons of cheese. Bake until the cheese has melted, about 2-4 minutes. Remove and add the top of bun and serve.
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