Heat oven to 350°F. Lightly grease 2 cookie sheets. Lightly spoon flour into measuring cup; level off. In large bowl, combine flour, sugar, brown sugar, baking powder and salt; mix well. Add melted chocolate, orange peel, oil, orange juice, vanilla and eggs; blend well. (Dough will be stiff.) Add 6 oz. chopped white baking bar; gently knead into dough.