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; top with layers of meat mixture, half the cheddar and remaining Dinner mixture. Cover.
BAKE 15 min. Top with salsa, remaining cheddar and crushed chips; bake, uncovered, 5 min.