01 -
Whip together the peanut butter, shortening, butter, and both sugars for a couple of minutes until fluffy. Add eggs one at a time, then mix in the vanilla.
02 -
In another bowl, stir together the flour, baking soda, and salt. Slowly combine this with the creamy mixture, stopping as soon as it's evenly mixed.
03 -
Preheat the oven to 375°F. Make small dough balls (about 1/2 inch), coat them in sugar, and place on a clean, ungreased baking tray. Bake for 6-8 minutes until they're set but still light in color.
04 -
Leave the cookies to rest directly on the baking tray for a couple of minutes, then move them to a wire rack to cool completely.
05 -
Boil the butter, cocoa powder, and milk together in a saucepan. Once that's done, take it off the heat, then beat in the powdered sugar and vanilla until smooth.
06 -
Spread or pipe the frosting onto one cookie, then gently press another cookie on top to create a sandwich.