Marinate the chicken by combining lime juice, avocado oil, chili powder, cumin powder, garlic powder, salt, and black pepper in a bowl. Add chicken thighs and let marinate for at least 15 minutes.
Cook the marinated chicken thighs on a grill or stovetop skillet over medium-high heat for 6–7 minutes per side until cooked through.
Grill fresh corn on the cob alongside the chicken or sauté frozen corn in a pan until heated through.
Mix half of the sour cream with mayonnaise and crumbled Cotija cheese, adding chili powder, salt, and pepper to taste.
Assemble the bowls starting with a base of cooked rice, topped with sliced grilled chicken, sweet corn, red onion, and creamy sauce. Garnish with extra Cotija cheese and fresh cilantro.
Serve with lime wedges on the side for an extra zesty kick.