Saute peppers and onions in olive oil for 5 minutes. Add garlic and cook for 1 more minute. Remove from the pan and set aside.
Brown Roast Beef for about 1-2 minutes in the same pan and then add the vegetables back into the pan.
Stir and top with cheese to melt.
Prepare sauce to spread on each roll by mixing together 1 tblsp. of mayonnaise and 1 tblsp. of ketchup for each roll.