In a large skillet, heat olive oil over medium heat. Add diced chicken, chili powder, cumin, garlic powder, salt, and pepper. Cook for about 6-8 minutes, or until the chicken is cooked through and no longer pink. Remove from heat and set aside.
In the same skillet, add corn and sauté for 3-4 minutes until heated through and slightly charred. Remove from heat.
In a small bowl, mix together mayonnaise and lime juice. Set aside.
To assemble the bowls, divide the cooked rice among four bowls. Top each bowl with the cooked chicken, sautéed corn, crumbled feta cheese, and sliced avocado.
Drizzle the lime mayonnaise over the top and garnish with chopped cilantro. Serve with lime wedges on the side.