Preheat oven to 450F.

Combine shredded cooked chicken and barbecue sauce in a small bowl.

Let the chicken mixture stand for 15 minutes to allow the flavors to meld.

Place pizza crust on a baking sheet.

Spread the chicken mixture evenly over the pizza crust.

Arrange sliced onion, green bell pepper, red bell pepper, and sun-dried tomatoes over the chicken.

Sprinkle pine nuts and crumbled dried oregano over the toppings.

Season lightly with salt and pepper to taste.

Spread shredded mozzarella cheese evenly over the pizza.

Bake pizza in the preheated oven until the crust is crisp and the cheese is bubbly, about 17 minutes.

Remove from oven and let cool slightly before slicing and serving.