TOP bread slices with ham; roll up. Place, seam-sides down, in 13x9-inch baking dish sprayed with cooking spray.
WHISK eggs, milk and pepper until blended; pour over roll-ups. Refrigerate overnight.
HEAT oven to 350ºF. Top casserole with cheese and tomatoes. Bake, uncovered, 45 to 50 min. or until center is set.