Vanilla Cardamom Whoopie Pies

Name: Vanilla Cardamom Whoopie Pies
Prep time: 30 min
Cook time: 8 min
Yield: 24
Cuisine: American,
Ingredients: Cookies; 2 cups (500 ml) all-purpose flour; 1/2 cup (125 ml) unsweetened baking soda; 1 tsp (5 ml) salt; 1/4 tsp (1 ml) cardamom ground (mccormick ); 1 cup (250 ml) buttermilk; 1 tsp (5 ml) pure vanilla extract (club house); 1 cup (250 ml) firmly packaged brown sugar; 1 egg; Vanilla Cardamom Filling; 1/2 cup (125 ml) butter softened; 1 1/2 cup (375 ml) icing sugar; 1 1/2 cup (375 ml) marshmallow fluff; 2 tsps (10 ml) pure vanilla extract (club house); 1/4 tsp (1 ml) cardamom ground (mccormick ); 1/3 cup (75 ml) finely chopped salted shelled pistachios