Preheat the oven to 375 degrees and line a baking sheet with aluminum foil. Spray the foil with cooking spray and set aside. Crush the cereal and french fried onions together. Cut the chicken breasts into strips, making sure to keep the strips as uniform as possible in size. I actually prefer to do this when the chicken is slightly frozen. After cutting, and for easy clean-up, I lay the chicken strips on a piece of aluminum foil.