Preheat oven to 400 deg F
Combine buttermilk and mustard in shallow flat bowl and whisk
Add chicken to mixture, turn to coat, set aside
Combine panko, walnuts, cheese, rosemary, salt and pepper in shallow flat bowl and mix well
Remove chicken from buttermilk mixture and dredge in panko mixture.
Option 1 for a both sides crispy
Coat a wire rack with cooking spray and place on baking sheet
Arrange chicken on rack and bake (14-20 minutes depending on chicken thickness)
Option 2, place chicken in a baking dish and bake (14-20 minutes depending on chicken thickness)
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