In a small bowl whisk together flour & baking powder - set aside
In mixer bowl beat butter until soft
Add sugar & mix well
Add egg- mix again
Add vanilla
Add flour & mix until dough begins to clump together
Roll dough into a ball & wrap with plastic wrap- refrigerate 1 hour
Once dough has chilled, preheat oven to 350 degrees
Pull off pieces of dough & roll into balls- then press into the wells of your muffin tin pan making the cup shape
Bake 12-15 minutes & allow to cool in pan before removing
To remove you can slide a butter knife along the side- they should pop right out