01 - In a large mixing bowl, beat unsalted butter and powdered sugar with an electric mixer on medium speed until mixture is light and fluffy, approximately 2 minutes.
02 - Add lemon zest and vanilla extract to the creamed mixture, mixing until just combined.
03 - Sift together all-purpose flour and salt in a separate bowl. Gradually add flour mixture to butter mixture, mixing on low speed until a cohesive dough forms.
04 - Divide dough in half. Flatten each portion into a disc, wrap in plastic wrap, and refrigerate for 30 minutes.
05 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
06 - On a lightly floured surface, roll dough to 1/4-inch thickness. Use a 2-inch round cookie cutter to cut shapes. Arrange half of the rounds on prepared baking sheets.
07 - With a smaller cutter, cut out the center of the remaining rounds to form the tops. Place alongside whole cookies on baking sheets.
08 - Bake for 11 to 13 minutes, or until edges are a pale golden color. Transfer to a wire rack and allow cookies to cool completely.
09 - Stir fresh lemon juice into raspberry jam. Spread about 1/2 teaspoon of the mixture onto the underside of each solid cookie base. Gently place a cutout cookie on top, pressing lightly to adhere.
10 - Dust assembled cookies with extra powdered sugar, if desired, before serving.