Preheat oven to 425 degrees then line a baking sheet with parchment paper. Place defrosted sheet of puff pastry onto the parchment paper then set aside.
Stir 1 Tbsp of barbecue sauce in with the cooked chicken, stirring to coat. Spread the remaining amount of barbecue sauce onto the puff pastry like pizza sauce, making sure to leave a ¾" border around the edges all the way around.
Distribute chicken evenly over barbecue sauce then top with shredded mozzarella and thinly sliced red onions.
Bake 15-20 minutes until the cheese is bubbly and just beginning to brown and the pastry crust is golden brown.
Remove from oven and let cool for 2 minutes before sprinkling with chopped cilantro. Slice into large pieces then serve!
We like our BBQ sauce extra spicy, but with so many varieties to choose from, you won’t have a problem selecting a sauce to suit your palette.