Preheat oven to 350 degrees.
Cream together butter and sugar until light and fluffy.
Add eggs, apple butter, and vanilla extract. Mix until combined.
In a separate bowl, mix dry ingredients - flour, oatmeal, baking powder, and salt.
Add dry ingredients and mix until combined.
Bake for 10-12 minutes. A longer bake will result in a crispier cookie.
Frost when the cookies have cooled.
The frosting recipes will frost 12 cookies. Double it to frost 24.