Make the Chipotle Ranch Sauce:
Add mayo, sour cream, chipotle peppers, ranch seasoning, lime juice, and garlic to a blender.
Blend until smooth, adjust seasoning, and refrigerate.
Prepare and Cook the Chicken:
Combine chili powder, cumin, garlic powder, smoked paprika, salt, and pepper.
Coat chicken with olive oil and rub with spice mix.
Grill on medium-high for 5–7 minutes per side, until 165°F internal temperature.
Rest chicken for 5 minutes, then dice.
Assemble the Burritos:
Warm tortillas. Spread 2 tbsp chipotle ranch sauce on each.
Add rice, beans, chicken, cheese, tomatoes, corn, onion, cilantro, and avocado.
Fold and roll burritos tightly.
Crisp the Burritos (optional):
Heat a skillet with a little oil.
Place burritos seam-side down and cook 2–3 mins per side until golden and crispy.