Heat oven to 375 degrees F.
In a large bowl, combine ground pork, onion flakes, corn flakes, salt, pepper and egg. In a small bowl stir together ketchup, brown sugar and dry mustard.
Spoon 2 tablespoons of the ketchup mixture into the pork and mix well. Spray muffin tin with vegetable cooking spray. Form 6 meatballs and place in muffin tin.
Coat the top of each meatball with the remaining ketchup mixture. Bake for 30 minutes at 375 degrees F., until nicely browned and glazed.