Pumpkin Whoopie Pies

INGREDIENTS

• For the butter cream filling:
• 1 egg white
• 2 tablespoons milk
• 1 teaspoon vanilla extract
• 2 cups powdered sugar, divided
• 3/4 cup shortening
• For the cookies:
• 2 cups brown sugar
• 1 cup canola oil
• 1 1/2 cups canned pumpkin
• 2 eggs
• 3 cups all-purpose flour
• 1 teaspoon salt
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• 1/1/2 teaspoons cinnamon
• 1/2 teaspoon cardamom
• 1/4 teaspoon ground cloves
• 1/4 teaspoon ground white pepper
• 1 1/2 teaspoons ground ginger