Preheat your oven to 475°F. If using a pizza stone, place it in the oven now to heat up.
On a well-floured surface, roll out your pizza dough to your desired thickness. Transfer to a greased pizza pan or baking sheet. Brush the outer crust edges with olive oil.
Place the cooked chicken in a bowl. Add 2 tablespoons of BBQ sauce and toss until all pieces are evenly coated. Set aside.
Spread the remaining BBQ sauce evenly over the pizza dough, leaving a 1-inch border around the edge for the crust.
Sprinkle half of the shredded mozzarella cheese over the sauce.
Distribute the BBQ chicken pieces evenly over the cheese. Layer the thinly sliced red onions on top of the chicken.
Sprinkle the remaining mozzarella cheese evenly over the top of the pizza.
Bake in the preheated 475°F oven for 12–15 minutes, until the crust is golden brown and the cheese is bubbly with golden-brown spots.
Remove from the oven and immediately scatter the fresh cilantro over the hot pizza.
Allow to cool for 2–3 minutes, then slice and serve.