Preheat the oven to 400°F.
Line a baking sheet with parchment paper and set aside.
Spread the barbecue sauce evenly on the flatbreads.
Top the flatbreads evenly with mozzarella cheese, diced red onion, sliced peaches, and shredded barbecue chicken.
Bake in the oven for 8-10 minutes.
Serve immediately.