Prepare the pizza dough according to instructions. After the first rise, divide into 2 balls.
Preheat the oven to 500 degrees F and line a large baking sheet with parchment paper (see note). Sprinkle semolina flour on top.
On a lightly floured surface, roll each ball into approximately 7x10-inch rounds. Carefully transfer the dough to the prepared baking sheet. Bake 8-12 minutes until golden and cooked through. Lower the oven temperature to 425 degrees F.
Brush the top of each flatbread with barbecue sauce, leaving a 1/2-inch space around the edges. Top evenly with the mozzarella, followed by the chicken, onion, and bell pepper if using. Drizzle with a bit of extra sauce (about 1-2 tablespoons per flatbread).
Bake for 8-12 minutes, or until the cheese is melted and the toppings are warmed through.
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Notes
If you'd like thinner, crispier flatbreads, the yeast in the pizza dough can be reduced by half and/or the rising time reduced to 30 mins.
If both flatbreads won’t fit on one baking sheet, they can be cooked in batches.
Make aheadThe flatbread can be prepared in advance and refrigerated for up to 3 days or frozen and then thawed before baking the flatbreads.