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!
Notes
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.