These Chocolate Peanut Butter Whoopie Pies have a creamy peanut butter buttercream filling sandwiched between soft and tender cake-like chocolate cookies. A delightful sweet treat that is simple to make!
Preheat oven to 375°F and line at least 2 cookie sheets with parchment paper.
In the bowl of a stand mixer fitted with the paddle attachment cream together the softened butter, brown sugar and granulated sugar until light and fluffy. About 3-4 minutes.
While the butter and sugars are creaming together, dissolve the instant coffee in hot water.
Add the egg, vanilla extract and coffee. Mix together well until creamy.
Add the all purpose flour, cocoa powder, baking soda and salt. Mix on low speed just until combined. It will be crumbly.
Add the buttermilk and mix together until smooth and creamy, and scraping the sides of the bowl as needed.
Using a heaping small scoop or a rounded tablespoon, drop cookies 2 inches apart on prepared cookie sheets.
Bake cookies on center rack in preheated oven for 9-11 minutes or until the cookies no longer look glossy and bounce back when touched. Let cookies cool on pan for 5 minutes then remove to wire rack to cool completely.
Peanut Butter Filling
In the bowl of a stand mixer fitted with the paddle attachment cream together the softened butter and peanut butter until light and creamy.
Add the powdered sugar and vanilla extract and mix on low speed until fully combined. Then bump up the speed to medium-low and mix until light and fluffy scraping the sides of the bowl as needed.
Using a medium scoop or 2 tablespoons, add the filling to the flat side of half the cookies and top with the remaining cookies.