01 - Whisk together 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 to medium-high heat. Cook chicken for 6-7 minutes per side until internal temperature reaches 165°F and juices run clear. Transfer to a cutting board and rest for 5 minutes before slicing into strips.
03 - While chicken rests, melt butter in a skillet over medium-high heat. Add corn kernels, chili powder, and salt. Cook for 5-7 minutes, stirring occasionally, until corn develops light char marks and is tender.
04 - Combine sour cream, mayonnaise, lime juice, garlic powder, and salt in a small bowl. Whisk until smooth and fully incorporated. Refrigerate until ready to serve.
05 - Distribute cooked rice evenly among four bowls. Arrange sliced chicken, charred corn, cotija cheese, cilantro, green onions, jalapeño slices, and avocado on top. Drizzle with crema and serve with fresh lime wedges.