In a large bowl, combine Roasted Garlic Mustard, Honey, buttermilk, salt, pepper and rosemary.
Place chicken thighs into bowl and let marinate 30 minutes.
Preheat oven 425° F.
Coat marinated chicken thighs with the breadcrumbs.
Place onto a generously oiled rimmed baking sheet and cook in preheated oven for 30-45 minutes, turning once or until golden brown on both sides and has an internal temperature of 165° F.