Beat butter and next 3 ingredients at medium speed with an electric mixer until creamy.
Add cream cheese, orange zest, and vanilla; beat until well blended. Gradually add flour mixture, beating at low speed until blended.
Divide dough in half, shaping into 2 flattened disks. Cover with plastic wrap, and chill 2 to 24 hours.
Preheat oven to 35
Place 1 dough disk on a floured surface.
Roll to 1/4-inch thickness; cut with a 4-inch star-shaped cutter.
Place 1 inch apart on ungreased baking sheets. Repeat procedure with remaining dough disk.
Bake at 350 for 8 to 10 minutes or just until edges are lightly browned. Cool on baking sheets 3 minutes.
Transfer to a wire rack, and let cool 30 minutes or until completely cool.
Spread cookies with a thin layer of Simple White Frosting; top with sprinkles.
Note: To make ahead, prepare recipe as directed through Step Freeze cookies in a heavy-duty zip-top plastic freezer bag up to 1 month. Thaw completely at room temperature before icing.