Heat the grill to medium-high heat - around 400° F.
Slice the 2 chicken breasts into 3rds lengthwise so that you have 6 thin breast pieces that will grill quickly. Drizzle with olive oil and season both sides with chili powder, cumin, oregano, garlic powder, salt, and pepper.
Place the chicken breasts on a clean hot grill and cook for 4 to 5 minutes on each side. Remove the chicken from the grill and set it aside on a plate. Keep the grill hot. Dice the chicken into cubes for the pizza.
Take the pita bread or naan, cheese, BBQ sauce, and diced chicken to the grill with you on a large cutting board. Brush one side of the pita bread very lightly with olive oil and rub a clove of garlic on the bread to give a slight garlic flavor.
Clean the grill grates and set the pita bread over low heat for 2 minutes to toast the top of the pita bread where all the toppings will go.
Remove the pita bread from the grill and assemble the pizza. Brush on BBQ Sauce, add the shredded mozzarella cheese, add the diced cooked chicken, then add the thinly sliced red onions.
Place the flatbread back onto the grill over low heat for about 5 minutes until the cheese is gooey and melted.
Remove from the grill, garnish with fresh jalapeno slices and parsley or cilantro.
Enjoy with a cool glass of beer.