Heat the oven to 450°F and place the pizza dough on a lightly oiled baking sheet.
Stir together ¾ cup BBQ sauce and the pumpkin puree in a small bowl until smooth.
Spread the pumpkin-BBQ mixture evenly over the dough.
Toss the shredded chicken with the remaining ¼ cup BBQ sauce, then scatter it over the sauce layer.
Sprinkle the mozzarella cheese on top, covering the chicken evenly.
Bake for 12-15 minutes until the crust is golden and the cheese is bubbly.
Remove from the oven and finish with green onions and roasted pumpkin seeds.