Save 40 calories and 5 grams of fat per serving by preparing with lean ground beef and KRAFT 2% Milk Singles.
Top meat mixture with chopped tomatoes, chopped onions and BREAKSTONE'S or KNUDSEN Sour Cream before covering with tops of buns.
Substitute 8 flour tortillas for the hamburger buns. Spoon meat mixture down centers of tortillas; top with Singles. Roll up.