4 oz mascarpone cheese
1 tbsp coffee liqueur, such as Kahlua
⅓ cup powdered erythritol
2 tsp strong-brewed coffee
For the mascarpone filling, whisk everything together until combined. To assemble, spread the bottom of one chocolate cookie with the mascarpone filling and press together to make a sandwich. Repeat with remaining cookies. Chill in refrigerator 20 minutes to set fillings.