01 - Combine olive oil, chili powder, smoked paprika, garlic powder, cumin, salt, black pepper, and lime juice in a bowl. Add chicken breasts and toss to coat thoroughly. Let marinate for 10–15 minutes at room temperature.
02 - Preheat grill or grill pan over medium-high heat. Place marinated chicken on the grill and cook for 6–7 minutes per side until internal temperature reaches 165°F and juices run clear. Remove from heat and let 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, stirring occasionally, until corn develops light char marks and becomes tender, about 5–7 minutes.
04 - Whisk together sour cream, mayonnaise, lime juice, garlic powder, and salt in a small bowl until smooth and well combined. Adjust consistency with a splash of water or lime juice if needed.
05 - Divide cooked rice evenly among 4 serving bowls. Arrange sliced grilled chicken, charred corn, cotija cheese, cilantro, green onions, jalapeño slices, and avocado on top of each bowl. Drizzle generously with crema and serve with lime wedges on the side.