Brownie Sandwich Cookies with Chocolate

      Prep Time: 30 minutes Cook Time: 13 minutes Yield: About 18 Sandwiches Ingredients 1/2 cup unsalted butter 12 oz good quality semi-sweet chocolate chips 1 1/2 cups all-purpose flour 1/4 cup unsweetened cocoa powder 1/2 tsp baking powder 1/4 tsp baking soda 1/2 tsp salt 1/2 cup packed light-brown sugar 1/2 cup…