Cut chicken breasts into bite size chunks and transfer to a medium size bowl. Add buttermilk, 1 teaspoon oregano, a pinch of salt and a pinch of pepper. Mix and make sure all chicken is covered. Tightly cover bowl and place in the refrigerator for at least an hour.
In a shallow bowl or plate, mix together corn flakes, flour, cayenne pepper, garlic powder, onion powder and remaining salt, pepper and oregano. Remove chicken from buttermilk marinade and gently press into the dry mixture to coat, making sure to rotate chicken to cover all sides.
Heat approximately 16 oz of oil in a large deep pan to somewhere between 350 and 375 degrees fahrenheit. Fry coated chicken in batches, making sure to not overcrowd the pan, until nicely browned on both sides. This usually takes about 3 to 4 minutes per side.
Remove chicken from oil and place immediately onto a plate that has been lined with paper towels to soak up excess oil. Serve immediately.