Macaroni Taco Bake

1 pkg. (14 oz.) KRAFT Deluxe Macaroni & Cheese Dinner

1 lb. ground beef

1 pkg. (1-1/4 oz.) Taco Seasoning Mix

3/4 cup Sour Cream

1-1/2 cups Shredded Cheddar Cheese, divided

1 cup Thick 'N Chunky Salsa

HEAT oven to 400°F. Prepare Dinner as directed on package. While Macaroni is cooking, cook meat with taco seasoning as directed on package.

STIR sour cream into prepared Dinner; spoon 1/2 into 8-inch square baking dish. Top with layers of meat mixture, 1 cup cheese and remaining Dinner mixture; cover with foil.

BAKE 15 min.; top with salsa and remaining cheese. Bake, uncovered, 5 min. or until cheese is melted.