Peanut Butter Sandwich Cookies

from Gastronomy
My amiga, Kari, shared this link a few weeks ago and it has been bookmarked tempting me since. I had to get over the amount of butter and the fact it used Skippy instead of Jiff, and then I was ready to make it. The original recipe says to use an ice cream scoop for the cookies- I tried that on one pan and they were way too big for my boca, so the rest I made with a cookie scoop. I made the filling and paired it with some cookies for sandwiches but had plenty of cookies left over to enjoy on their own.
Ingredients
Cookies
2 cups all-purpose flour
2 tsp. baking powder
4 tsp. baking soda
1 pound (4 sticks) unsalted butter, at room temperature
 2/3 cup creamy peanut butter, preferably Skippy
 1 cup granulated sugar
1 cup firmly packed light brown sugar
2 large eggs
 1 1/2 tsp. vanilla extract
 1/3 cup coarsely chopped peanuts
 2 1/2 cups quick-cooking oats

Filling
¼ pound (1 stick) butter, at room temperature
½ cup creamy peanut butter, preferably Skippy
1 2/3 cups confectioners’ sugar
Directions
1. Preheat oven to 350 degrees. In a bowl, mix together the flour, baking powder and baking soda; set aside. Using a mixer with a paddle attachment, cream together the butter and peanut butter. Add sugars and beat at medium speed for 4 minutes, scraping down bowl twice.
2. At low speed, add eggs and vanilla. Add flour mixture and beat at low speed until well mixed, frequently scraping down bowl. Add peanuts and oats, and mix well. Using a cookie scoop, place balls of dough on parchment-lined baking sheets at least three inches apart.
3. Bake until cookies have spread and turned very light golden brown, about 10 minutes. Remove from oven and set aside to cool and firm up, 5 to 10 minutes. Transfer to a rack to cool completely before filling.
4. To make the filling, use an electric mixer, cream together the butter, peanut butter, and confectioners’ sugar until very smooth. Transfer the filling to a pastry bag or makeshift pastry bag (i.e. Ziploc bag). To assemble cookies, pipe filling on underside of a cookie. Sandwich with another cookie. Repeat.