Pumpkin Spice Whoopie Pies

• 2 cups butter
• 2 cups granulated sugar
• 2 teaspoons baking powder
• 2 teaspoons baking soda
• 1 teaspoon salt
• 1 tablespoon ground cinnamon
• 1 tablespoon ground nutmeg
• 1 tablespoon pumpkin spice
• 2 eggs
• 2 teaspoons vanilla
• 15-ounce can pumpkin
• 4 cups all-purpose flour