Hazelnut-Espresso Sandwich Cookies Recipe: How to Make It

Ingredients

• 1 cup butter, softened
• 1-1/4 cups sugar
• 1 large egg, room temperature
• 1 large egg yolk, room temperature
• 4 teaspoons instant espresso granules
• 2 teaspoons vanilla extract
• 2-1/2 cups all-purpose flour
• 1/2 teaspoon salt
• 1/2 teaspoon baking powder
• 1 cup finely ground hazelnuts
• FILLING:
• 1-3/4 cups semisweet chocolate chips, divided
• 1-1/4 cups milk chocolate chips
• 1 cup heavy whipping cream