Preheat the oven to 190C/375F.
Mince the onion and garlic. Slice the mozzarella brick into small rectangles (this will be stuffed inside the meatloaf)
In a large bowl, mix the meatloaf ingredients together and knead for 1-2 minutes with your hands.
Line the Bundt pan with the bacon running it vertically up the sides of the ring and making sure that each opening is covered with bacon-y goodness.
Add half of the hamburger mixture to the pan over the bacon slices.
Place the cheese rectangles all around the ring over the hamburger.
Cover with the other half of the hamburger and make sure all of the cheese if fully covered.
Tightly wrap the hanging bacon slices over the meatloaf.
Brush a tablespoon of ketchup over the bacon and place it in the oven to bake for 50-60 minutes.
Take out of the oven, place a plate over the bundt mold and flip upside down. Watch out for the piping hot liquid. I personally flipped mine over a baking pan so that the liquid couldn't fall out.
Brush another tbsp of ketchup over the bacon and place it back into the oven on the high rack for 2 minutes, just to let the ketchup sink in the bacon.
Take out of the oven and cut into 8 pieces. The oozing cheese will be sooo yummy. Feel free to eat it as is, or top with more ketchup or some tomato sauce :)