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Nana’s Butter Cookies with Milk-Jam Filling

From: bonappetit.com
Makes 16

cookies
1½ cups (3 sticks) unsalted butter, room temperature
2/3 cup powdered sugar
2 teaspoons vanilla extract
2 tablespoons whole milk
2 teaspoons kosher salt
2½ cups all-purpose flour, plus more
1 large egg
Milk jam and assembly
1qt. goat’s milk or cow’s milk
1¼ cups granulated sugar
¾ teaspoon baking soda
½ vanilla bean, halved lengthwise
Powdered sugar (optional; for serving)

cookies

Using an electric mixer on high speed, beat butter, powdered sugar, and vanilla in a medium bowl until light and fluffy, about 4 minutes. Reduce speed to low; add milk, salt, and 2½ cups flour and mix just to combine. Form dough into a ½”-thick disk and wrap in plastic. Chill until firm, at least 1 hour.

Let dough sit at room temperature to soften slightly, about 5 minutes. Roll dough out between 2 sheets of parchment paper until about 1/8” thick. Cut out rounds with a floured 2½”-diameter cookie cutter. Cut out a circle in half of the rounds with a ¾”-diameter cookie cutter and transfer to 2 parchment-lined baking sheets, spacing 1” apart.

Whisk egg and 1 tsp. water in a small bowl and brush tops of cookies with egg wash. Bake cookies, rotating halfway through, until golden brown, 12–15 minutes. Transfer baking sheets to wire racks and let cookies cool.

DO AHEAD: Dough can be made 5 days ahead. Keep chilled.

MILK JAM AND ASSEMBLY

Combine milk, sugar, and baking soda in a large saucepan; scrape in vanilla seeds and add pod. Bring just to a boil over medium heat, stirring to dissolve sugar.

Reduce heat and simmer, whisking occasionally, until mixture is reduced to about 1¼ cups (it will darken and separate, with little bits visible), 80–90 minutes.

Strain milk jam through a fine-mesh sieve into a medium bowl and let cool. Spoon a small amount of milk jam onto flat side of a cookie without a hole and sandwich with a cookie with a hole.

Repeat with remaining cookies and filling.

Dust with powdered sugar, if desired.

DO AHEAD: Milk jam can be made 1 week ahead. Cover and chill.