Pour olive oil into a medium skillet and place over medium heat. Once oil is hot, add sliced green pepper. Cook until soft and then season with salt and pepper. Remove vegetables to a plate and set aside while you prepare the sandwiches. Preheat your panini press to medium. Butter one side of your bread slices. Flip over two slices and stat layering your sandwiches: cheese, peppers, 1/4 pound roast beef and another slice of cheese. Place in panini press, close the lid, and press until the bread is toasted, the inside is warm and the cheese is melted.
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