Cheese Filled Meatloaf

I got this recipe from a college roommate.  Thirty plus years later it is still "My Meatloaf Recipe".

1 slice torn bread

1/3 cup oatmeal

1/3 cup milk

1 ½ pound ground beef

1 egg yolk (save white for cheese filling)

2 tablespoons dehydrated onion or ¼ cup chopped onion

½ teaspoon salt

¼ teaspoon pepper

¼ teaspoon dry mustard

¼ teaspoon sage or poultry seasoning

¼ teaspoon garlic salt

1 tablespoon Worcestershire sauce

Cheese filling:

1 egg white

1 tablespoon water

2 slices of bread torn into pieces

2/3 cup grated cheese

Topping:

1/3 cup catchup

1 teaspoon prepared mustard

1 tablespoon brown sugar

Mix together first set of ingredients. Pat 2/3 of mixture into loaf pan covering bottom and ½ way up the sides.

Mix together cheese filling ingredients. Fill meat in pan with cheese filling. 

Flatten remaining 1/3 of ground beef mixture, place over cheese. 

Press down around edge to seal top to bottom.

Bake 1 hour at 350.  In a small bowl mix topping ingredients together.  After an hour spread topping on meatloaf.  Finish baking another 30 minutes.  Bake 90 minutes total.