MIX first 4 ingredients with 1 cup cheese and 1/2 cup salsa.
PRESS evenly into 12 muffin cups sprayed with cooking spray. Use back of spoon to make indentation in center of each. Place muffin pan on foil-covered baking sheet.
BAKE 20 to 25 min. or until meatloaves are done (160°F). Top with remaining salsa and cheese; bake 3 min. or until cheese is melted.