In a medium bowl, combine the mayonnaise, sour cream, lime juice, and cayenne pepper (if using). Mix well and set aside.
Season the chicken breasts with chili powder, garlic powder, paprika, salt, and pepper.
Heat the olive oil in a large skillet over medium heat. Add the seasoned chicken breasts and cook for about 6-7 minutes per side, or until fully cooked and no longer pink in the center. Remove from the skillet and let rest for a few minutes before slicing.
In the same skillet, add the corn and cook for 2-3 minutes until heated through.
To assemble the bowls, divide the cooked rice among four serving bowls. Top each bowl with sliced chicken, corn, a drizzle of the creamy sauce, crumbled feta cheese, and chopped cilantro.
Serve immediately and enjoy!