In a large bowl, combine the corn, mayo, sour cream, lime juice and chili powder and mix to combine.
In a casserole dish, lay the chicken breasts flat in the dish with a little space in between each one. Season with salt, garlic powder and cayenne pepper. Spread the corn mixture evenly over the top of the chicken.
Bake at 350 for 30-40 minutes or until chicken is cooked through to 165 degrees.
Remove from oven and garnish with crumbled queso fresco and chopped cilantro