Combine butter, sugar, and egg in large mixer bowl. Beat at medium speed until creamy. Reduce speed to low; add flour, orange juice, vanilla, and baking powder. Beat until well mixed. Divide dough into thirds. Wrap in plastic wrap and shape into disks. Refrigerate until firm (about 2-3 hours).

Heat oven to 400 degrees. On lightly floured surface roll out dough, 1/3 at a time (keeping remaining dough refrigerated). Roll to 1/4 inch thickness. Cut with cookie cutters. Place 1 inch apart on ungreased cookie sheets. Sprinkle with decorative sugars if you dont plan on frosting them. Bake 6-10 minutes or until edges are very lightly browned. Cool completely.