1 medium onion, thinly sliced
1 medium green pepper, thinly sliced
1/2 cup mayonnaise, divided
1/4 cup zesty Italian salad dressing
3/4 cup thinly sliced deli roast beef
5 sandwich rolls, split
3/4 cup shredded mozzarella cheese

In a large a large skillet, sauté the onion and pepper in 2 tablespoons mayonnaise until crisp-tender. Remove vegetables and keep warm. Reduce heat and add roast beef, Italian dressing and remaining mayonnaise to the skillet. Cook and stir until heated through, about 5 minutes. Place beef and vegetables on rolls. Top with mozzarella cheese.