01 - Combine olive oil, chili powder, smoked paprika, garlic powder, cumin, salt, black pepper, and lime juice in a bowl. Add chicken breasts and coat thoroughly. Let marinate for 10-15 minutes at room temperature.
02 - Preheat grill or grill pan over medium-high heat. Grill chicken for 6-7 minutes per side until internal temperature reaches 165°F and juices run clear. Transfer to cutting board and rest for 5 minutes before slicing into strips.
03 - While chicken rests, melt butter in skillet over medium-high heat. Add corn kernels, chili powder, and salt. Cook stirring occasionally until lightly charred, about 5-7 minutes.
04 - Whisk together sour cream, mayonnaise, lime juice, garlic powder, and salt in small bowl until smooth and fully combined.
05 - Divide cooked rice among 4 bowls. Arrange sliced chicken, charred corn, cotija cheese, cilantro, green onions, jalapeño, and avocado on top. Drizzle with crema and serve with lime wedges.