For the Whoopie Pies:
3 cups all-purpose flour
2 tablespoons cinnamon
1 teaspoon baking powder
1 teaspoon baking soda
1 teaspoon salt
1 teaspoon ground ginger
½ teaspoon ground nutmeg
1 cup granulated sugar
1 cup dark brown sugar
1 cup canola or vegetable oil
3 cups chilled pumpkin puree (canned pumpkin)
2 eggs
1 teaspoon vanilla extract

For the Maple-Cream Cheese Filling:
3 cups powdered sugar
8 ounces cream cheese, at room temperature
4 ounces (½ cup) unsalted butter, at room temperature
3 tablespoons maple syrup
1 teaspoon vanilla extract