1Heat the olive oil in a small sauté pan over low heat. Add the onion and cook until caramelized.
Meanwhile, preheat a gas grill or cast-iron grill pan on medium heat. Oil the grates and make sure they are well coated. Season the chicken with salt and pepper, to taste, and grill until the internal temperature reaches 165 degrees, about 6-7 minutes per side. Once cool, dice the chicken.
2Preheat the oven to 450 degrees.
Flour and dust both sides of the dough, then stretch and roll out the pizza dough to the size of your pizza screen. Dock the pizza dough with a fork to pierce and poke small holes all around the dough (this prevents bubbling during the cooking process).
3Coat the pizza screen with cooking spray and transfer the dough to the pizza screen. Evenly spread the barbecue sauce all around the dough leaving 1 inch from the edge. Sprinkle the mozzarella and provolone all around the pizza. Sprinkle the caramelized onions over the top of cheese, followed by the bacon and diced chicken.
4Place in the oven for 8 minutes, rotating once during the cooking process. Cut into 8 even slices. Garnish with the chopped scallions. If using, lightly brush the garlic oil around the edge of pizza before serving.