Step 1

In a small saucepan, combine chocolate and butter. Heat over low heat until both have melted. Stir until smooth and set aside.

Step 2

In a small bowl, combine flour. Baking powder, salt, and espresso powder. Set aside.

Step 3

In a mixing bowl, beat together eggs, sugar, and vanilla until the mixture begins to thicken. Stir in cooled chocolate mixture followed by the flour mixture. Beat until combined. Fold in chocolate chips. Let batter stand for 10 minutes in order to thicken up.

Step 4

Preheat oven to Drop dough by the tablespoon full about onto a lined baking sheet, keeping each cookie about 2 inches apart. Bake for 8 minutes or until edges are set and cookies are slightly cracked. Let cool for 1 minute before removing to a cooling rack.

Step 5

For the filling:

Step 6

Beat together mascarpone and cream cheese. Add in powdered sugar, vanilla, and liqueur.

Step 7

Spread a healthy tablespoon of filling on the flat side of one cookie, top with another cookie. Makes 12 sandwich cookies. Store assembled cookies in an airtight container.