Preheat oven to 350°F. Spray a casserole dish with nonstick spray. Pour 1 cup of BBQ sauce into the bottom of the casserole dish (optional; see note below).
2 cups BBQ sauce
Place the Cheez-Its in a large Ziplock back and seal. Crush using your hands until finely crushed. Pour into a shallow bowl and set aside.
2 cups White Cheddar Cheez-Its
Pour the remaining 1 cup of BBQ sauce into a separate shallow dish.
Start by dipping each chicken breast into the bowl of BBQ sauce, patting down both sides to make sure it's completely covered. Dip the BBQ chicken into the bowl with Cheez-Its and completely cover both sides. Use your fingers to pat down the crackers into each piece of chicken. Place each covered chicken breast into the casserole dish.
4 boneless, skinless chicken breasts
Bake, covered with foil, for 30 minutes, and then remove cover and continue cooking for another 15 minutes. Be sure to check the chicken for doneness before removing from the oven. When white throughout, it's done!