Preheat the Oven: Preheat your oven to 425°F (220°C) and line a baking sheet with parchment paper or foil for easy cleanup.
Prepare the Chicken: In a bowl, mix the shredded chicken with ½ cup BBQ sauce until evenly coated.
Prep the Flatbreads: Place flatbreads on the prepared baking sheet. Brush lightly with olive oil or garlic butter to help crisp the base and add flavor.
Layer the Base: Spread a thin layer of BBQ sauce over each flatbread (optional, for more flavor).
Assemble the Flatbreads: Sprinkle half the mozzarella and cheddar cheese evenly over the base. Top with the BBQ chicken, red onion slices, and remaining cheese.
Bake: Bake in the oven for 10–12 minutes, or until the edges are golden and the cheese is melted and bubbly.
Finish and Garnish: Remove from the oven and sprinkle with fresh cilantro. Add any additional toppings like jalapeños or a drizzle of BBQ sauce.
Serve: Slice and serve immediately while hot and melty.