Begin by preparing the toppings. In a medium skillet over medium heat, combine pulled pork, caramelized onions, and 1/4 cup barbecue sauce. Stir to combine and cook until warmed through, about 4-5 minutes. Set aside.
In a medium bowl, stir together mozzarella and cheddar cheeses until combined and set aside. Gather diced jalapeno and set aside.
Preheat oven to 400 degrees.
Scoop some flour into a bowl and set it next to your working area. Lightly dust a large baking sheet with flour, spreading it around evenly. Then dust your palms with flour and stretch the dough, using both hands, until it is roughly the size of your pan. Use additional flour as necessary to prevent the dough from sticking to your hands.*
Lay your stretched dough in the pan and lightly flour the bottom surface, reaching a hand gently underneath it, to prevent the dough from sticking to the pan.
Spoon up to a 1/2 cup of barbecue sauce onto the dough a little at a time, spreading it around with the back of a spoon. Continue until the dough is covered with a thin layer of sauce, leaving about a 1-inch border for the crust.
Next, sprinkle handfuls of the cheese blend onto the pizza. We recommend starting from the edges and working in towards the center, using a lighter hand, and then adding more cheese where needed to fill in the gaps.
Top the pizza with the pork and onion mixture and diced jalapenos, then drizzle with additional barbecue sauce.
Finally, season the crust. Lightly brush the crust with melted butter, then sprinkle with garlic powder, onion powder, and sea salt.
Bake for approximately 18 minutes, or until crust is golden and cheese is bubbly and lightly browned. Let cool for at least 2 minutes before slicing.
Gently loosen pizza from the pan with a metal spatula, then slice, serve, and enjoy!