Beat butter and sugar.
Add in the egg and mix thoroughly.
Add flour, vanilla, cinnamon, baking powder, and oats to the mixture.
Mix well.
Roll out dough on a well-floured surface with a floured rolling pin.
Cut with a floured cookie cutter.
Place on parchment-lined cookie sheet and bake at 350 degrees.
For 7-9 minutes until just golden.
Makes 4 dozen cookies