Combine lime juice, avocado oil, chili powder, cumin powder, garlic powder, salt, and black pepper in a bowl. Coat each chicken thigh evenly with the mixture and let it marinate for at least 15 minutes.
Heat a grill pan over medium-high heat. Add the marinated chicken thighs and cook for about 6–7 minutes on each side until golden brown and cooked through.
Grill fresh corn on the cob alongside the chicken until tender and slightly charred, or sauté frozen corn until heated through.
In a mixing bowl, combine half of the sour cream with mayonnaise, crumbled Cotija cheese, chili powder, salt, and pepper. Mix well until creamy.
Start with a scoop of cooked rice in each bowl. Top with grilled chicken, grilled corn, red onion, and dollops of the creamy sauce. Finish with extra Cotija cheese and cilantro.
Serve immediately with lime wedges on the side for an extra zesty kick.