- 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.