In a shallow bowl combine melted butter with 1-1/2 teaspoons garlic powder and (if using) 2 teaspoons Dijon mustard.
In another bowl combine all breading ingredients (remove about half to another small bowl to add in as needed).
Dip the breast into the melted butter turning a few times to coat generously, then coat in the breading mixture pressing down firmly with hands to adhere the coating to the breast (you may need to turn the chicken breast a few time to coat well).
Place on baking sheet.
Continue with remaining chicken adding in more breading to the bowl as needed to coat the chicken.
Bake for about 35-40 minutes or until the chicken is cooked through.