Pumpkin Whoopie Pies

INGREDIENTS

• 1 teaspoon ground cinnamon
• 1 cup packed light brown sugar
• 1/2 teaspoon salt
• 3/4 stick (6 tablespoons) unsalted butter, softened
• 1/2 teaspoon baking powder
• 1 (15-ounce) can pure pumpkin (not pie filling)
• 1/2 tablespoon water
• 1/2 cup vegetable oil
• 1/2 cup pecans
• 1/4 teaspoon freshly grated nutmeg
• Pinch of salt
• 1 1/2 cups confectioners' sugar
• 6 ounces cream cheese, softened
• 1/2 teaspoon baking soda
• 2 tablespoons packed light brown sugar
• 1 teaspoon pure vanilla extract
• 1/2 teaspoon ground ginger
• 1 tablespoon bourbon (optional; substitute 1 teaspoon vanilla extract)
• 1 large egg
• 1 1/2 cups all-purpose flour
• 1/4 teaspoon ground cloves