Prepare the pizza dough according to your favorite recipe or thaw store-bought dough completely.
Preheat the oven to 475°F (246°C) for at least 20 minutes. If using a pizza stone, place it inside the oven while preheating.
Lightly grease a pizza pan or baking sheet with half the olive oil and sprinkle with cornmeal.
On a lightly floured surface, shape the dough into a 12-inch circle about ½-inch thick. Let it rest for 5–10 minutes if it shrinks while stretching.
Transfer the dough to the prepared pan and pinch the edges to form a crust.
Press small dimples into the dough using your fingertips to reduce bubbling.
Brush the remaining olive oil over the crust.
Spread ⅓ cup barbecue sauce evenly over the dough.
Toss the cooked chicken with the remaining barbecue sauce and distribute evenly across the BBQ Chicken Pizza.
Sprinkle the mozzarella and smoked Gouda evenly over the chicken.
Add the sliced red onion on top.
Bake for 14–15 minutes, or until the crust is golden brown and the cheese is bubbly.
Remove the pizza from the oven and garnish with chopped cilantro or fresh basil.
Slice and serve immediately while hot.