In a large bowl, beat together the butter, vanilla, and both sugars for 5 minutes.
Scrape down the sides of the bowl.
Add flour and beat on low speed until just combined.
Shape the dough into a disc and wrap it in plastic. Refrigerate for 30 minutes.
Line a baking sheet with parchment paper and place aside.
Roll out the shortbread cookie dough on a lightly floured surface until 1/8 inch thick.
Cut cookies and place them on the tray. Decorate with sprinkles.
Refrigerate for 15 minutes.
Meanwhile, preheat the oven to 325 F.
Bake the cookies for 12-14minutes.
Remove from the oven. Place on a wire rack to cool