Preheat oven to 350F. Line a baking sheet with parchment paper.
Beat butter and sugar until blended and fluffy.
Add flour and vanilla and beat until well combined.
Divide dough half and refrigerate half of the dough.
Divide remaining dough into three equal pieces.
Tint one piece of cookie dough blue.
Tint one piece of cookie dough red.
Shape each piece of dough (red, white and blue) into a log 8-inches long 1 ½ inches wide and about ¼-inch thick.
Place blue dough on flat surface. Top with white dough then red dough.
Roll in wax paper or parchment paper and freeze 30 minutes or until dough is firm enough to slice.
Repeat with remaining refrigerated cookie dough.
Slice chilled cookie dough log into 18 cookies.
Arrange on prepared baking sheet and sprinkle with cake sparkles.
Bake 15 minutes or until bottoms are golden.
Cool 3 minutes on baking sheet. Transfer to wire rack and cool completely.
Repeat with remaining chilled cookie dough log.