Chocolate Sandwich Cookies

Ingredients

• 1/2 stick (4 tablespoons) unsalted butter, at room temperature
• 4 tablespoons vegetable shortening
• 1 1/4 teaspoons pure vanilla extract
• 1-1 1/2 cups confectioner's sugar
• 1 recipe Chocolate Wafer Cookies

Directions

1. 1. In a large bowl, mix the butter, shortening, and vanilla until well blended. Add the first 1 cup of confectioner's sugar and stir until the sugar is incorporated completely into the butter mixture. The filling should be thick and stiff. Add more confectioner's sugar, one tablespoon at a time, to reach the desired consistency.
2. 2. Place one-half of the chocolate wafer cookies upside down on a level surface. Divide the filling among the cookies and flatten with wet hands or a spoon. Place the other half of the cookies right side up on top of the filling and press down gently to create sandwich cookies.