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In a medium bowl, drag collectively the flour, baking powder, and salt; space apart.
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With an electrical mixer, beat the butter and granulated sugar at medium-excessive velocity until pale and fluffy, about 3 minutes. Beat within the egg and vanilla. Reduce the mixer velocity to low and gradually add the flour mixture, mixing elegant until mixed. (Enact now not overmix.)
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Accomplish the dough into 2 disks and wrap in plastic. Chill until company, on the least 1 hour and up to 2 days.
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Heat oven to 375° F with the racks within the upper and decrease thirds. Line 2 baking sheets with parchment. Working with 1 disk at a time (support the last disks chilled), on a evenly floured ground, roll the dough out ¼ creep thick. The usage of a evenly floured 1½-creep spherical cookie cutter, decrease the dough into circles and put 2 inches apart on the ready baking sheets. (If the dough turns into too gentle, relax hasty on a baking sheet.)
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Bake the cookies, rotating the baking sheets halfway thru, until the perimeters are golden, 8 to 10 minutes. Transfer to a cooling rack and mud the tops with ½ cup of the confectioners’ sugar.
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Unfold half of the cookies with ½ teaspoon jam every, then sandwich with the comfort of the cookies. Factual sooner than serving, sprinkle the cookies with the last ¼ cup confectioners’ sugar.
Storage Suggestion
Preserve the cookies at room temperature, between sheets of wax paper in an hermetic container, for up to two days.