01 - Combine olive oil, chili powder, smoked paprika, cumin, garlic powder, salt, pepper, and lime juice in a bowl. Add chicken and toss to coat thoroughly. Let marinate for at least 15 minutes, or up to 2 hours for deeper flavor penetration.
02 - Rinse rice under cold water until water runs clear. Bring water to a boil in a saucepan, add rice and salt. Cover, reduce heat to low, and simmer for 15 minutes or until grains are tender. Remove from heat and fluff with a fork before serving.
03 - Heat a grill pan or skillet over medium-high heat. Cook marinated chicken for 5–6 minutes per side until internal temperature reaches 165°F and juices run clear. Let rest for 5 minutes to redistribute moisture, then slice against the grain.
04 - Melt butter in a skillet over medium-high heat. Add corn kernels and cook for 4–5 minutes until slightly charred and golden. Remove from heat, then stir in mayonnaise, sour cream, cotija, minced garlic, chili powder, lime juice, salt, and pepper until well combined.
05 - Divide cooked rice evenly among 4 serving bowls. Arrange sliced chicken, street corn mixture, diced avocado, cherry tomatoes, and fresh cilantro on top. Garnish with extra cotija cheese if desired and serve with lime wedges for squeezing.