Preheat the oven. Set it to 425°F (220°C).
If you have a pizza stone or sheet pan, preheat that too for a crisper bottom.
Prep the chicken. Toss the cooked chicken with 2 to 3 tablespoons of BBQ sauce and a spoonful of ranch. Season with a pinch of salt and pepper. This keeps the chicken juicy and flavorful.
Warm the flatbread. Brush lightly with olive oil and sprinkle a little garlic powder if you like.
Slide onto the hot stone or pan for 2 to 3 minutes to firm it up. This helps prevent sogginess.
Build the sauce base. Spread a thin layer of BBQ sauce over the flatbread, then drizzle or lightly spread ranch on top. Aim for a BBQ-forward base with streaks of ranch rather than a heavy blanket.
Add the cheese. Sprinkle mozzarella evenly, then add cheddar for sharpness.
Don’t overload—leave a little space so the cheese can bubble, not pool.
Top it off. Scatter the sauced chicken and red onion slices over the cheese. Add a small pinch of crushed red pepper if you want a kick.
Bake. Return to the oven for 8 to 12 minutes, until the cheese is melted and bubbling and the edges are golden. If needed, broil for 1 minute to brown the top.
Finish fresh. Let it rest for 2 minutes.
Sprinkle with cilantro, add a light ranch drizzle, and a squeeze of lime if you like brightness.
Slice and serve. Cut into squares or strips. Serve extra BBQ and ranch on the side for dipping.