Special equipment: a pizza pan
Preheat the oven to 450 degrees F for 20 minutes.
Heat the olive oil in a medium skillet over medium-high heat. Season the chicken with salt and pepper, add to the pan and saute until cooked through, about 5 minutes. Set aside.
Toss and stretch the pizza dough into a thin 20-inch pie crust on a pizza pan.
Spread the BBQ sauce on the dough in a spiral movement from the inside out with a ladle or a large spoon. Sprinkle with the cheese and then spread the onions evenly on the pizza, followed by the chicken.
Bake until the dough is crispy, 6 to 8 minutes, depending on your oven. Scoop out slivers of avocado and finish the pizza with them. Add the green onions and cilantro to taste.