Cheeseburger Mini Meat Loaves

I got this recipe from my mother-in-law, and it is now one of my families Favorite suppers. And its so quick and easy!!

1 1/2 lbs of beef
1 egg
1 cup of cheese mozza or Cheddar
1/3 cup onion
1/4 cup bread crumbs or cracker crumbs
2 Tbsp relish
2 Tbsp mustard
1/2 cup Ketchup

Combine and mix beef, egg, and 1/2 of cheese, onion, bread crumbs, relish, mustard and salt and pepper. Spray muffin cups with Pam, roll meat into big balls and place in muffin pan. Make indentations with spoon in top of balls, fill with ketchup. Sprinkle remaining cheese. Bake @ 375' for 30 minutes.