#1 Preheat a grill on medium-high heat and lightly oil the grate #2 Mix black beans, salsa, cilantro, and lime juice in a bowl set aside #3 Mix chili powder, cumin, coriander, brown sugar, cayenne pepper, and olive oil in a bowl until smooth rub mixture over chicken breasts #4 Cook chicken breasts on grill until the juices run clear, 10 to 12 minutes per side. An instant-read thermometer inserted into the center should read at least 165 degrees F (74 degrees C). While the chicken is cooking, place tortillas on grill and grill until lightly brown on both sides, 3 to 5 minutes #5 Move chicken to a cutting board and cut into long thin strips. Divide chicken strips over tortillas and top with bean salsa mixture, lettuce, and remaining cup cilantro #6 Top with avocado, lime wedges, and sour cream.