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 half the Dinner mixture into 8-inch square baking dish sprayed with cooking spray. Top with layers of meat mixture, 1 cup shredded cheese and remaining Dinner mixture; cover.
BAKE 15 min.; top with salsa and remaining shredded cheese. Bake, uncovered, 5 min. or until cheese is melted.