Mix the mustard and apricot jam together for the sauce.
Heat a non-stick skillet over medium-high heat and add the onions and bacon. Cook, stirring often, until bacon is cooked complete. Remove the bacon and onion mixture to a bowl.
To the same skillet, add the chopped brats. Cook until browned, stirring occasionally. This will take about 6 - 8 minutes.
To bake, preheat the oven and pizza stone (the pizza stone should be placed on the center rack of your oven) to 500 degrees for at least 30 minutes. Transfer each ball of dough to a piece of parchment paper. Shape the dough into circles with lightly floured hands. Top each pizza with a thin layer of the mustard and apricot jam sauce. Then top each pizza with an equal amount of the cooked brats, shredded cheese, black olives (if using) and bacon and onion mixture.
Transfer each pizza (with parchment) onto the pizza stone. After each pizza has baked for about 5 minutes, carefully remove the parchment paper from under the crust (so the paper doesn't scorch in the oven) and continue baking until the crust and cheese are browned, 10 - 15 total minutes.