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.