Ina frying pan heat the oil over medium heat. Cook the bell peppers & onions in the oil for about 8 to 10 mins. Stir occasionally until vegetables are tender. Remove from the heat. Refrigerate veggies for about 10 mins or until cool.
In a small bowl mix the cream cheese,mayonnaise & steak sauce until smooth. Spreaad cream cheese mixture over each tortilla to within 1/4 inch of the edge.
Place equal amounts of roast beef & veggies on each tortilla. Sprinkle with cheese. Roll up each tortilla tightly, cut each roll into 8 pieces & serve with cocktail toothpick.