Preheat oven to 375 degrees F. Line 12 count muffin tin with cupcake liners. In a large bowl, combine the beaten egg, milk, steak sauce, uncooked quick cooking oats, beef and salt.
Divide mixture into twelve equal portions. Insert one cheese cube into center of meat and roll in hands to form the meat around the cheese into a ball. Place into muffin tin and continue with remaining meat and cheese.
In a separate small bowl, combine the ketchup and brown sugar. Stir thoroughly and spread over each mini meatloaf.
Bake uncovered on center oven rack for 25 minutes.