01 -
Heat oven to 350°F. Line baking sheets.
02 -
Cream butter, sugars and peanut butter. Add egg and vanilla. Mix in dry ingredients.
03 -
Roll into balls, flatten with fork, and bake 8-10 minutes. Cool completely.
04 -
Beat peanut butter and butter. Add sugar and enough milk for spreading consistency.
05 -
Spread filling on one cookie and top with another to make sandwiches.