Preheat your oven to 375°F and position the rack in the center. While it heats, prepare your ingredients: measure out the BBQ sauce, shred the chicken if needed, thinly slice the red onion, and have the cheese grated and ready. This ensures everything is prepped and you can work quickly once assembly begins.

Place the flatbread on a baking sheet or oven-safe skillet. Spread the BBQ sauce evenly across the surface, leaving a small border around the edges so it doesn't burn. Layer the shredded chicken and red onion over the sauce, then sprinkle the garlic powder over the toppings for subtle depth. Top everything with the shredded colby jack cheese in an even layer. I like to press the cheese down slightly so it adheres to the sauce and creates a cohesive topping.

Slide the assembled flatbread into the preheated oven and bake for 15 to 20 minutes until the cheese is melted and bubbly with light golden-brown edges. I check at the 15-minute mark to see how much browning has occurred—every oven varies, so keep an eye on it toward the end of baking. The flatbread should have some color on the edges but not be overly charred.

Remove the flatbread from the oven and let it cool for 1-2 minutes so the cheese sets slightly and becomes easier to handle. Scatter the fresh cilantro over the top for brightness and garnish. Slice into strips or wedges and serve immediately while the cheese is still warm and gooey.