HEAT oven to 400°F. Prepare Dinner as directed on package. While Macaroni is cooking, brown meat; drain. Add taco seasoning mix and water to meat; simmer 5 min.

STIR sour cream into prepared Dinner. Spoon half of the Dinner mixture into 8-inch square or 9-inch round baking dish; top with layers of the meat mixture, 1 cup of the cheese and remaining Dinner mixture. Cover.

BAKE 15 min. Top with salsa and remaining 1/2 cup cheese. Bake, uncovered, an additional 5 min. or until cheese is melted.