====Description===
The fluffy, caramel provides buttery relief from the dense, chocolaty crumb of the cookie - the kind that packs to the back of your palate and begs for a glass of milk.

==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)

==Method==

  - 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. 

===Salted Caramel Buttercream===
==Ingredients==
  * 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

==Method==
  - 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.

====Notes====
From http://www.foodess.com/2009/02/whoopie-pies-with-salted-caramel-buttercream/