Preheat your oven to 400°F (200°C) and prepare a baking sheet with parchment paper.

In a mixing bowl, combine flour, water, salt, and olive oil. Mix until a dough forms.

Roll out the dough on a floured surface to your desired thickness and place it on the prepared baking sheet.

In another bowl, mix shredded chicken with BBQ sauce until well coated.

Spread the BBQ chicken over the flatbread, then sprinkle with cheese and top with red onions.

Bake in the oven for 15 minutes or until the edges are golden and the cheese is bubbly.

Remove from the oven, let cool for about 5 minutes, and garnish with fresh cilantro before slicing.