Brown meat with peppers in large skillet; drain. Return to skillet. Stir in salsa, tomatoes and corn.
Spread 1 cup meat mixture onto bottom of 13x9-inch baking dish sprayed with cooking spray; top with 6 tortillas, overlapping as necessary. Cover with layers of half each of the remaining meat mixture and cheese; top with remaining tortillas and meat mixture. Cover.
Bake 25 to 30 min. or until heated through. Top with remaining cheese; let stand, uncovered, 5 min. or until melted.