Prepare the pizza dough according to recipe instruction. You can use frozen dough as well.
Preheat oven to 400F degrees. Place the chicken in a small glass pyrex. Pour all the barbecue sauce over and cook for approximately 25 minutes. Once the chicken is fully cooked, cut it into small cubes. Collect all the sauce from them pyrex and add to the cubed chicken (this step can be done the day before you plan on making this recipe)
Place a pizza stone in the oven and preheat both oven and stone to 500F degrees. If you place the pizza stone in the heated oven, it will crack.
Roll the pizza dough into a round. Place the pizza round onto a floured peel and top it with barbecue sauce, chicken, red onions and mozzarella cheese. Garnish to salt and pepper to taste.
Slowly slice the pizza off the peel onto the heated pizza stone in the oven. Bake for 5 minutes. Carefully remove the pizza by sliding the peel underneath the pizza to pull it out.
Serve hot. Refrigerate or freeze remaining pizza.