Cut chicken breasts into thick strips and soak in buttermilk.
Preheat oven to 425°F. Place a large piece of parchment paper on the rimmed baking sheet (10x15) and brush butter over the parchment. It might seem like too much butter, but you need it to crisp up the coating!
Combine flour, Panko, seasoning salt, paprika and pepper in a large zip-top bag. Add the chicken and shake to coat **
Place your chicken on the prepared baking sheet, leaving a space between each strip. Bake 10 minutes, flip gently with a spatula, and bake another 10 minutes. (If the pan is dry when you flip the chicken, add a drizzle of oil to ensure the bottom crisps as well)
Be sure to check to make sure your chicken is cooked (165°F), as the thickness can greatly affect baking time. You want it to be done but not overdone and dry. Bake another 4-5 minutes if needed.
Remove to a plate lined with paper towel to soak up any excess grease. Serve immediately. To keep warm until serving, place on a wire rack on a baking sheet in a 225°F oven.