Chocolate Shortbread

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For the cookies:

2 sticks unsalted butter, at room temperature

1 large egg yolk

1 teaspoon pure vanilla extract

1/2 teaspoon salt

1/4 teaspoon ground cloves

1 1/4 cups confectioners' sugar

1/3 cup unsweetened Dutch-process cocoa powder

2 cups all-purpose flour, plus more for dusting

For the icing:

1 cup confectioners' sugar

1/4 teaspoon pure vanilla extract

1 to 2 tablespoons milk

Sanding sugar, for decorating