1In large bowl, beat sugar, melted baking chips and butter with electric mixer on medium speed until creamy, or mix with spoon. Beat in orange juice, vanilla and egg (mixture may appear curdled). Stir in flour, baking powder, orange peel and salt. Cover and refrigerate about 1 hour or until easy to handle.
2Heat oven to 350°F. Shape dough into 1-inch balls. Place about 2 inches apart on ungreased cookie sheet.
3Bake 9 to 12 minutes or until set (cookies will not brown). Immediately press orange slice piece into center of each cookie. Cool 2 minutes; remove from cookie sheet to wire rack.