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Whoopie Pies with Salted Caramel Buttercream

Dessert
American

Ingredients
  

  • 1 3/4 cups all-purpose flour
  • 3/4 cup cocoa powder
  • 1 1/2 teaspoons baking soda
  • 1/2 teaspoon salt
  • 1/2 cup butter softened
  • 1/2 cup white sugar
  • 1/2 cup packed brown sugar
  • 1 cup milk
  • 1 egg
  • 1 teaspoon vanilla extract
  • Salted Caramel Buttercream below

Salted Caramel Buttercream

  • 1/2 cup sugar divided
  • 2 tbsp water
  • 2 tbsp + 2 tsp 40 mL cream
  • 2 egg whites
  • pinch of salt
  • 1/2 cup butter softened
  • 1/2 tsp vanilla extract

Instructions
 

  • Preheat oven to 375 degrees. Grease two large cookie sheets, or line with parchment paper.
  • Whisk together the flour, cocoa powder, baking soda and salt.
  • In the bowl of a standing mixer, cream the butter and sugars together, 2-3 minutes. Add the egg and continue beating until fluffy, 1-2 minutes longer. Beat in milk and vanilla extract. Finally, beat in flour mixture to combine.
  • Drop by heaping tablespoons onto prepared cookie sheets (you should get 12-14 cookies).
  • Bake for 10-14 minutes, until top springs back when touched.
  • Cool completely. Spoon a heaping tablespoon of frosting on the flat half of one cookie, then top with another cookie. Repeat.
  • Put 1/4 cup of sugar and water in saucepan over medium-high heat. Do not stir of you will get sugar crystals, but you can swirl the saucepan gently. It will bubble itself into a deep amber. Remove immediately from heat and add cream (careful - it will bubble up furiously). Stir until smooth and set aside.
  • Put the egg whites, salt, and 1/4 cup sugar in a heatproof bowl over a pot of simmering water. Whisk until sugar dissolves and mixture reaches 140 degrees. Transfer to bowl of standing mixer.
  • Beat on high until stiff peaks form. Add butter a bit at a time, and continue beating on medium. Reduce speed to low, add vanilla extract, and then caramel (you may need to gently rewarm the caramel in the microwave for 10 seconds at a time until it is workable but not burning hot). Beat for 4-5 minutes.