In a medium-sized bowl, mix together the ground pork, garlic, fennel, dried basil, dried oregano, salt, and pepper.
Place a skillet over medium-high heat. Once hot, add the sausage and break it up into crumbles, cooking it until cooked through and there is no pink left. Let it drain on paper towels.
In a medium-sized bowl, stir together the crushed tomatoes, parmesan, dried basil, dried oregano, garlic powder, and onion powder.
Place a large piece of parchment paper on your work surface. Place the pizza dough in the center. Stretch it out to an oval shape or the shape of your 8-quart slow cooker.
Lift the pizza dough up using the parchment paper to help and place it in the slow cooker. If you have to adjust it more in the slow cooker, do so now.
Press the mozzarella into the dough, leaving a ½-inch border. Add the cooked sausage on top, followed by the pizza sauce. Add the 2 tablespoons of parmesan and finally a drizzle of olive oil.
Carefully lift the edges of the crust, so it sits above the fillings.
Place a large piece of paper towel over the slow cooker and put the lid on. Place on high for 2-3 hours or low 4-5 hours.
Lift the pizza out by the parchment once it is done and let it sit for 15 minutes. Slice and serve with more parmesan and fresh chopped parsley if desired.