Step 1

Preheat oven to 400F.

Step 2

Cook ground beef in a large frying pan over medium-high heat with a dab of butter or margarine.

Step 3

Crumble ground beef well while it's cooking.

Step 4

Once the ground beef is cooked, drain excess grease from the pan.

Step 5

Add the diced onions to the pan with the ground beef and stir well.

Step 6

Continue cooking for a few minutes, stirring occasionally.

Step 7

Remove the pan from the heat and add bacon bits, mayo, ketchup, mustard, salt, pepper and onion powder. Stir well.

Step 8

Spread 6 of the slices of bread with 1/4 cup of the margarine and then cut them in half.

Step 9

Lay the pieces of bread, margarine side down, in a greased 9 x 13 inch baking dish.

Step 10

Sprinkle 2 cups of the cheese on top of the bread.

Step 11

Spoon the meat mixture on top of the cheese and spread it out evenly.

Step 12

Sprinkle the remaining 2 cups of cheese over the meat.

Step 13

Spread 6 more slices of bread with 1/4 cup of margarine and cut them in half as well.

Step 14

Lay the pieces of bread, margarine side up, on top of the casserole.

Step 15

Place the dish in the oven and bake until the top bread is golden brown. 20-24 minutes.

Step 16

Serve and enjoy!