Eggnog Whoopie Pies

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For the Cookies:

2 3/4 cups all-purpose flour

2 teaspoons baking powder

1 teaspoon ground cinnamon

1/2 teaspoon ground allspice

1/2 teaspoon ground nutmeg

1/4 teaspoon salt

1 stick unsalted butter, at room temperature

1 1/2 cups granulated sugar

1 teaspoon vanilla bean paste

1 large egg plus 1 egg yolk

1/2 cup whole milk

For the Filling:

1 stick unsalted butter, at room temperature

1 3/4 cups confectioners’ sugar, plus more for dusting

1/4 teaspoon salt

2 tablespoons dark rum

1 teaspoon vanilla bean paste

Red nonpareils or coarse sugar, for decorating