Cook chicken on a lightly oiled grill over medium heat for about 5 minutes on each side or until lightly charred and cooked through.
Let cool slightly and cut into bite-size strips. Puree the tomato sauce and dried pepper in a blender or food processor.
Transfer to a small saucepan and cook over medium heat for 15 minutes.
Add rotisserie chicken to skillet and toss well to coat; season to taste with salt.
Place the flour tortillas on a flat surface. Top half of each tortilla with equal amounts of cheese, mango, bell pepper, green onion and chicken; fold the tortilla
Cook in a large skillet on both sides until cheese is melted and tortilla is crisp, about 5 minutes per side.
Serve with mango sauce.
In a small bowl, mix mango, red bell pepper, red onion, cilantro, lime juice, and salt.