Marinate the Chicken: In a bowl, combine olive oil, lime juice, chili powder, cumin, salt, and pepper. Coat the chicken breasts with the marinade and let it sit for at least 30 minutes.
Grill the Chicken: Preheat your grill or grill pan over medium-high heat. Cook the chicken for about 6-7 minutes on each side, or until fully cooked and juices run clear. Let it rest before slicing.
Prepare the Corn: If using fresh corn, grill it until slightly charred. If using frozen or canned corn, simply heat it through. Mix the corn with mayonnaise, cilantro, and feta cheese in a bowl.
Assemble the Bowls: In each serving bowl, add a generous scoop of rice, sliced grilled chicken, and the corn mixture on top. Drizzle with extra lime juice if desired.
Serve and Enjoy: Garnish with additional cilantro and enjoy this Chicken Corn Rice Bowl warm.