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 simmer over medium heat for 15 minutes. Add grilled chicken to pan and toss well to coat; season to taste with salt. Place flour tortillas on a flat surface. Top half of each tortilla with equal amounts of cheese, mango, bell pepper, green onion and chicken; fold over tortilla. Cook in a large skillet on both sides until cheese is melted and tortilla is crisp, about 5 minutes on each side. Serve with mango salsa. Mango Salsa: In a small bowl, stir together mango, red bell pepper, red onion, cilantro, lime juice, and salt.