Heat a large skillet over medium heat and cook the bacon until done and crispy. Remove bacon and place on paper towels to absorb fat. Remove all but 2 tablespoons of bacon fat from the pan, leaving the remaining 2 tablespoons in the pan.
Reduce heat to medium low and cook shallot, garlic, sliced Brussels Sprouts, salt and pepper for roughly 6 to 8 minutes. Remove from heat and set aside.
Prep your oven by placing the oven rack near the top of the oven to broil the pizza. Preheat your oven to broil. At the same time, place your cast iron skillet on the stovetop and turn the heat on high. You want to heat the cast iron skillet for 10 minutes or until it is VERY hot. If it begins to smoke to much, turn down the heat, but you do want the skillet very hot.
**-- USE HEAVY OVEN MITTS – THE SKILLET WILL BE HOT**
While the skillet is heating, place the toppings on the dough. Add 2 to 3 ounces of cheese to the dough first, then add the Brussels Sprouts, shallots and bacon. Top with the remaining cheese.
Using a thick pot holder, carefully slide the pizza into the hot cast iron skillet and quickly place it in the oven under the broiler. Turn off the stove top! :-) Broil pizza for 1 minute. Using the thick pot holder again, grab the handle and rotate the pan 180 degrees. Broil for 1 more minute. Remove pizza immediately and place on the stovetop. Let cool for roughly 5 minutes, then use a large spatula to remove the pizza.
Slice and serve!