Preheat a grill over medium-high heat. When hot, place the chicken breasts on the grill and cook until the chicken is cooked through with nice grill marks, (grill will be closed) about 4 minutes a side. Transfer the cooked chicken to a cutting board and let rest while you prepare the pizzas. Reduce the heat on the grill to Medium.
Spread 1/4 cup of the bbq sauce on top of each of the naan flatbreads. Next, tear up 1 slice of the smoked gouda cheese and spread evenly on top of each. Evenly distribute the shredded mozzarella on top. Slice the chicken thinly and evenly distribute on top of the naan. Lastly, add the sliced onion and sliced jalapeno, if using.
Carefully transfer the loaded naan pizzas to the grill. Cover and grill until the cheese is melted, hot and bubbly, and the naan is crisp on the bottom, about 5 minutes.
Using a sturdy spatula, transfer the flatbreads to a large serving board and slice into 4 big slices. Garnish with the chopped cilantro. Serve your guests and ENJOY! yum!