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 evenly. 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 cooked through and internal temperature reaches 165°F. Transfer to a cutting board and let rest for 5 minutes before slicing.
03 - 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 is 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 teaspoon of water if needed.
05 - Divide cooked rice among 4 serving bowls. Arrange sliced chicken, charred corn, cotija cheese, cilantro, green onions, jalapeño slices, and avocado on top. Drizzle generously with crema and serve with lime wedges.