Preheat your grill or grill pan over medium-high heat. In a small bowl, mix together the chili powder, garlic powder, onion powder, cumin, smoked paprika, salt, and pepper.
Rub the chicken breasts with olive oil and then coat them evenly with the spice mixture.
Grill the chicken for about 6-7 minutes on each side, or until the internal temperature reaches 165°F. Remove from the grill and let it rest for 5 minutes before slicing.
While the chicken is resting, warm the flour tortillas on the grill for about 30 seconds on each side until pliable.
To assemble the burritos, place 1/2 cup of cooked rice on each tortilla, followed by sliced grilled chicken, shredded lettuce, diced tomatoes, cheddar cheese, and a drizzle of chipotle ranch dressing.
Fold in the sides of the tortilla and then roll it up tightly from the bottom to the top. Repeat with the remaining tortillas and ingredients.
Serve immediately, or wrap in foil to keep warm.