In a bowl, combine lime juice, avocado oil, chili powder, cumin, garlic powder, salt, and black pepper.
Coat the chicken thighs evenly with the marinade and refrigerate for 15–30 minutes.
Heat a skillet over medium-high heat. Cook the chicken for 8–10 minutes per side until fully cooked. Rest briefly, then slice.
In a bowl, mix corn, red onion, 1/2 cup sour cream, mayonnaise, cotija cheese, chili powder, salt, pepper, and a squeeze of lime juice.
Reheat the cooked rice with a splash of water until warm and fluffy.
Assemble the bowls with rice, sliced chicken, street corn topping, extra cotija, and cilantro.
Drizzle with remaining sour cream and garnish with lime wedges before serving.