Mix flour, baking powder, and oleo until crumbly.
Add sour cream, egg yolks, whole egg, and vanilla. Mix to form a dough.
Cover and refrigerate 1 hour or overnight.
Preheat oven to 350°F.
Roll dough thin (⅛ inch). Cut into long strips.
Wrap strips around foil-covered clothespins.
Place on ungreased baking sheet.
Bake 12–15 minutes until lightly golden.
Cool completely before removing from pins.
For filling: beat Crisco + butter. Add vanilla.
Slowly add powdered sugar + milk. Mix until fluffy.
Pipe buttercream into each cooled shell.
Store or freeze as desired.