01 - In a bowl, combine olive oil, chili powder, smoked paprika, cumin, garlic powder, salt, pepper, and lime juice. Add chicken and toss to coat. Let marinate for at least 15 minutes (up to 2 hours for more flavor).
02 - Rinse rice under cold water. In a saucepan, bring water to a boil, add rice and salt. Cover, reduce heat, and simmer for 15 minutes or until tender. Fluff with a fork.
03 - Heat a grill pan or skillet over medium-high heat. Cook chicken for 5–6 minutes per side or until fully cooked (internal temp 165°F). Rest 5 minutes, then slice.
04 - In a skillet over medium-high heat, melt butter. Add corn and cook until slightly charred, about 4–5 minutes. Remove from heat and stir in mayonnaise, sour cream, cotija, garlic, chili powder, lime juice, salt, and pepper.
05 - Divide rice among 4 bowls. Top with sliced chicken, street corn mixture, avocado, tomatoes, cilantro, and extra cotija. Serve with lime wedges.