Melt butter in a skillet over low heat. Add the garlic and saute for 1 minute. Remove from heat, and stir in the Dijon mustard. Combine lemon zest
, tarragon and bread crumbs on a plate. Pour garlic mixture into a shallow bowl. Dip chicken into the mixture, and then dip into bread crumb mixture to coat. Place chicken in a roasting pan or baking dish
. Season with salt and pepper if desired. Cover with foil and bake
at 350F (175C) for 30 minutes or until chicken is cooked through and juices run clear.