Such a fun idea... and tasty too! Mmm, looking at the picture below makes me want to go have another.
1 lb lean ground beef
1/2 c finely chopped onions
1/2 c crushed crackers (I used red-fat Ritz)
1 1/2 c, divided, Mexican cheese mix shredded
1 c salsa, divided
Preheat oven to 400 degrees. Combine beef, onions, egg, crackers, and 1 cup of cheese with 1/2 c salsa. Press into 12 muffin cups sprayed with cooking spray. Use the back of a spoon to make an indentation in the center of each meatloaf. Put muffin pan on a foil-lined baking sheet and bake for 20-25 min. Top with remaining salsa and cheese, and bake for about 5 more minutes.