In a small bowl, mix the chili powder, smoked paprika, garlic powder, onion powder, cumin, salt, and black pepper.
Rub the chicken with olive oil and lime juice, then coat it evenly with the seasoning mixture.
Cook the chicken on a grill, in a skillet, or on a grill pan over medium heat until the internal temperature reaches 165°F.
Let the chicken rest for 5 minutes, then slice.
While the chicken cooks, heat butter or oil in a skillet over medium-high heat. Add the corn and cook until warm and lightly browned in spots.
In a medium bowl, stir together the mayonnaise, sour cream, lime juice, chili powder, garlic powder, cotija cheese, cilantro or parsley, salt, and pepper.
Fold the warm corn into the creamy mixture. Taste and adjust with more lime juice, salt, or cheese if needed.
Add cooked rice to each bowl. Top with sliced chicken, creamy street corn, extra cheese, green onions, herbs, lime wedges, and any other toppings you like.
Serve warm.