01 -  Preheat grill or grill pan to medium-high heat. 
 02 -  In a mixing bowl, coat chicken breasts evenly with olive oil, smoked paprika, garlic powder, salt, and black pepper. Allow to marinate for 10 minutes. 
 03 -  Grill marinated chicken for 5 to 7 minutes per side until fully cooked and internal temperature reaches 165°F. Rest for 5 minutes, then slice thinly. 
 04 -  Combine mango, red onion, bell pepper, jalapeño, cilantro, lime juice, and salt in a medium bowl. Mix gently and set aside. 
 05 -  Preheat oven to 400°F. Brush both sides of each tortilla with olive oil, arrange on a baking sheet, and bake for 3 to 4 minutes per side until lightly crisp yet flexible. 
 06 -  On each serving plate or tray, lay one tortilla as a base. Spread 2 tablespoons barbecue sauce, arrange sliced chicken, spoon mango salsa, and sprinkle cheese if using. Add a second tortilla, repeat layers, and finish with salsa and cheese. 
 07 -  Return assembled stacks to the oven for 4 to 5 minutes, until cheese is melted and stacks are heated throughout. 
 08 -  Garnish with fresh cilantro and serve immediately while warm.