Heat a small skillet over medium-high heat. Coat pan with cooking spray. Add onion to pan; saute 5 minutes or until slightly browned. Remove from heat; cool slightly.
Combine onion, breadcrumbs, and next 7 ingredients (through egg white) in a large bowl.
Stir in 2 tablespoons of the ketchup.
Spoon about 1/2 cup of the meat mixture into each of 3 muffin cups coated with cooking spray; place muffin tin on a baking sheet. (This is necessary to keep the oven clean, as the juices of the meatloaves tend to bubble up out of the muffin cups and can drip on the floor of the oven.).
Combine remaining 1 tablespoon ketchup with hot pepper sauce in a small bowl. Brush ketchup mixture over meat loaf tops.
Bake at 350 for 30 minutes or until a thermometer registers 165 degrees.