With an electric mixer, cream together butter and sugar until smooth.
Beat in eggs and vanilla.
Add flour, baking powder, and salt. Combine.
Cover and chill for one hour.
Preheat oven to 400℉. Roll out dough to ¼ inch thickness with a floured rolling pin on a floured surface. Cut leaf shapes with floured cookie cutters and move to a parchment paper lined cookie sheet with a floured spatula. Allow room for cookies to rise slightly.
Bake for 6 to 8 minutes. Cool completely before decorating.
Use food color misting sprays to create fall leaf effects. Attach eyes with decorator icing. Add mouths with edible marker.
Enjoy!