Begin by marinating the chicken. In a mixing bowl, combine minced chipotle in adobo, smoked paprika, garlic powder, cumin, salt, and pepper with olive oil. Coat the chicken breasts thoroughly and let marinate for at least 30 minutes (or up to 2 hours for more flavor).
Preheat a grill pan or skillet over medium-high heat. Add the marinated chicken breasts and cook for about 6-7 minutes on each side, or until the internal temperature reaches 165°F (75°C). Remove from the pan and let rest for 5 minutes.
While the chicken is resting, warm the tortillas slightly in a dry skillet or microwave, just until pliable.
Slice the chicken into thin strips.
To assemble the burritos, place a tortilla on a flat surface. Add about ¼ cup of rice, ¼ cup black beans, ¼ cup corn, a handful of sliced chicken, some cheese, and a few slices of avocado on the lower third of the tortilla.
Sprinkle with fresh cilantro and a dollop of sour cream.
Fold in the sides of the tortilla, then roll it up tightly from the bottom to enclose the filling. Repeat for all tortillas.
If desired, toast the burritos seam-side down on a skillet for 2-3 minutes on each side until golden and crispy.
Serve your burritos warm with lime wedges on the side.
Notes
Marinate the chicken for up to 2 hours for more flavor.