In a bowl, mix lime juice, avocado oil, chili powder, cumin, garlic, salt, and pepper. Add chicken thighs and coat evenly. Cover and refrigerate for 15–30 minutes to marinate.
Heat a skillet over medium-high heat. Sear the marinated chicken for 8–10 minutes per side until cooked through and golden. Rest for 5–10 minutes, then slice.
In a separate bowl, combine corn, red onion, sour cream, mayonnaise, Cotija cheese, chili powder, salt, pepper, and lime juice. Stir until creamy and well mixed.
Warm the rice with a splash of water until fluffy.
Assemble the Tasty Street Corn Chicken Bowl by layering rice, sliced chicken, and street corn topping. Garnish with extra Cotija, cilantro, lime wedges, and reserved sour cream if desired.