01 - Preheat oven to 220°C (425°F). Line a baking sheet with parchment paper.
02 - In a mixing bowl, combine the shredded chicken with 1/2 cup of BBQ sauce. Toss until evenly coated.
03 - Arrange the flatbreads on the prepared baking sheet. Spread a thin layer of BBQ sauce across each flatbread, leaving a small border around the edges.
04 - Evenly distribute half of the mozzarella and gouda/cheddar cheeses over the flatbreads.
05 - Scatter the sauced chicken over the cheese layer. Top with the sliced red onions and jalapeños, if using.
06 - Sprinkle the remaining cheese over the assembled toppings.
07 - Bake for 12–15 minutes, or until the cheese is molten and bubbly and the edges of the flatbreads are golden and crisp.
08 - Remove from the oven. Garnish with fresh cilantro leaves and an additional drizzle of BBQ sauce, if desired. Slice and serve immediately while warm.