Cut each chicken breast in half. If you prefer chicken strips, you can also cut them into strips.
Place chicken pieces in a large resealable bag and cover with buttermilk. Seal bag tightly, squeezing out all the air. Marinate chicken for at least 1 hour or up to overnight.
Preheat oven to 400 degrees.
Spray the bottom of a 9x13 pan or 11x17 pan with cooking spray then cut up the butter into pieces and place around the bottom of the pan. This keeps the chicken from sticking to the pan.
Place the pan in the oven for about 8-10 minutes until the butter is melted and HOT.
While butter is melting in the oven, combine seasoning salt, pepper, flour, and paprika in a shallow dish or pie plate. Set aside.
Remove the pan from oven and spread melted butter around the bottom of the pan.
Shake excess buttermilk off of chicken and completely coat each piece with the seasoning mix.
Place each coated piece of chicken in the pan.
Bake for 15 minutes.
Remove pan from oven and carefully turn each piece of chicken over. Continue baking for 15-20 more minutes, or until cooked through.