Season chicken with chili powder, cumin, smoked paprika, garlic powder, salt, and pepper.
Cook chicken in olive oil over medium-high heat for 5 to 6 minutes per side until cooked through. Rest 5 minutes then slice.
Char corn in the same skillet over high heat for 2 to 3 minutes undisturbed, then stir and cook 1 more minute. Remove from heat.
Mix mayo, sour cream, lime juice, chili powder, and smoked paprika. Toss with charred corn.
Assemble bowls with rice, sliced chicken, street corn, cotija, and cilantro. Serve with lime wedges.