In a medium-sized bowl, combine ground beef, eggs, onions, bread crumbs and mustard. Line a bread pan with slightly overlapped bacon ensuring that they hang over the edges of the pan.
Spread half the beef mix in the pan. Create a slot in the center and place down the Baybel ® cheeses. Spread diced tomatoes and pickles around and cover with the remaining beef mixture.
Fold the bacon slices to close up the loaf, and bake for 45 minutes at 350 ° F. Unmold and enjoy!