Place baking stone in the center of the oven, and preheat oven to 500 degrees F one hour before baking.
Cut bacon into 1-inch pieces and cook in a large skillet. Drain on paper towels and set aside.
Wipe out the bacon grease and brown the ground beef in the same skillet leaving large pieces when breaking it apart. Drain off excess fat and set aside.
Place pizza dough on a sheet of parchment paper and press into an 11 to 12-inch circle. Sprinkle shredded cheddar cheese around the edge. Alternate method – cover a pizza peel or flat baking sheet with cornmeal, to prevent the dough circle from sticking.
Spread barbecue sauce around the center of the circle. Do not worry if some of the shredded cheese gets caught in the sauce.
Sprinkle ground beef and bacon pieces over sauce. Spread the onion slices and diced tomatoes evenly over the top of the meat.
Sprinkle the mozzarella (and any remaining cheddar) over the top of the pizza.
Carefully slide a pizza peel under the parchment paper, then slide onto the preheated baking stone. Bake for 10 minutes, or until cheese is bubbling and starting to brown.
Allow pizza to cool for a few minutes and drizzle with additional barbecue sauce. Cut into 8 slices and serve.
Cook the bacon only until cooked through, and not extra-crispy. The bacon will continue cooking in the oven.
I poured a small amount of barbecue sauce into a zipper-topped bag then snipped off the end to drizzle sauce over the finished pizza.
It is best to work with room temperature pizza dough. If dough shrinks, it is too cold. Allow to rest for five to ten minutes and try again.
This recipe originally had six, baked onion rings instead of the red onion. If using, cook according to the package directions and add to the baked pizza right before serving.
The original recipe also had raw diced tomato instead of cooked, and 0.5-cup of shredded lettuce added just before serving.