Jam Sandwich Cookies

Heat oven to 375 degrees F. Line 2 baking pans with parchment paper. Combine flour, baking powder, and salt in a bowl. Beat butter and granulated sugar with an electric mixer on medium speed until light and fluffy. Beat in the egg, milk, and vanilla. Beat in the flour mixture until smooth. Divide the dough in half and roll out between two sheets of parchment paper. Chill for 15 minutes and cut out 2-inch round cookies. Bake on prepared pans until edges are golden, about 7 minutes. Cool on a wire rack. Cook the preserves over medium heat until thickened and reduced to 1 cup. Cool completely. Sandwich 1 teaspoon jam between 2 cookies. Dust with confectioners' sugar. Store in an airtight container for up to 1 week. Nutritional information is based on 1 cookie.