1. Pre-heat oven to 375°F
2. In a medium mixing bowl, cream butter and sugar together.
3. Add egg, vanilla, peanut butter, milk and mix well.
4. Sift in flour, baking soda and salt, then mix until combined. Dough will be thick, I find using my hands work better than a mixer at this point.
5. Use cooking spray to spray a cookie sheet and set aside.
6. I love these in the mini form, though you can make them any size you would like.
7. Roll cookie dough into small balls and press a dinner fork down into the top of the dough, then repeat in a cross pattern on each ball.
8. If making mini cookies, bake for 6 to 7 minutes.  Larger cookies, bake for 8-9 minutes.  Do not over bake.  You will know when its done if there are small holes in the tops of the cookie when looking closely.
9. Remove from oven and transfer to a wire rack to cool completely before assembling.

For the Peanut Butter Creme

1. In a small bowl, cream the butter and peanut butter together.
2. Then add the powdered sugar, vanilla and 1 tbsp of milk and mix until creamy.
3. If mixture is too thick add the second tbsp of milk and mix again.
4. Mixture will be thick, you do not want this runny.
5. After cookies are cooled, take one cookie and spread about a tablespoon of peanut butter cream.
6. Take another cookie and press the bottom of that cookie on the creme to make the sandwich.
7. Repeat for remaining cookies.
8. Then enjoy every bite!