Cheeseburger Meatloaf

This recipe is the inspiration for several other meatloaf recipes I've created. I found this one in Quick Cooking magazine. You can add in or take out anything you like or don't like on a burger.

1/2 cup ketchup, divided
1 egg
1/4 cup dry bread crumbs
1 tsp onion powder
1 lb lean ground beef
2 tsps prepared mustard (optional)
2 tsps dill pickle relish (optional)
6 slices American cheese

In a bowl, combine 1/4 cup ketchup, egg, bread crumbs and onion powder.
Crumble beef over mixture, mix well. Pat mixture into a 10 x 6 inch rectangle on waxed paper.
Spread 1/4 cup ketchup over meat to within 1/2 inch of long sides and 1 1/2 inches of short sides.
Top with mustard and relish (and anything else you like.) Place 4 cheese slices on top.
Roll up loaf, jelly-roll style starting with short side. Seal seams and ends well.
Place loaf, seam-side down into pan.
Bake at 350 degrees for 45 minutes or until a meat therometer reads 160 degrees.
Place 2 slices of cheese on top, then back into the over for 5 minutes to melt.