1-Making the Cookie Dough: Start by preparing your dough. In a mixing bowl, beat together the butter, granulated sugar, brown sugar, and cinnamon (if using) with an electric mixer until light and fluffy. This typically takes about 30 to 60 seconds. The mixture should appear pale and increased in volume. Once creamed, stir in the vanilla extract until well combined.

In a separate bowl, whisk the all-purpose flour, almond flour, cornstarch, and salt. Gradually add this dry mixture to the butter mixture, mixing on low speed until the dough just comes together. Be careful not to over-mix, as this can develop the gluten in the flour and result in tough cookies.

2-Chilling the Dough: Divide the dough into two equal portions and shape each into a disc. Wrap each disc in plastic wrap and refrigerate for at least 30 minutes. Meanwhile, preheat your oven to 350°F (175°C) and line baking sheets with parchment paper.

3-Cutting and Baking: Working with one disc at a time, roll out the chilled dough on a lightly floured surface to about ⅛ inch thickness. Using scalloped-edge cookie cutters, cut out 2 ½ inch circles. For half of the cookies, use a smaller cutter (such as a heart or star) to create a window in the center.

Place the cookies with and without cutouts on separate parchment-lined baking sheets. This ensures even baking, as the cookies with cutouts may bake slightly faster. Bake for 9 to 10 minutes or until the edges just start turning light golden brown. Be careful not to overbake, as these cookies should remain tender and pale in color.

4-Assembling the Cookies: Allow the cookies to cool completely on the baking sheets or on wire racks. Once cooled, lightly dust the cookies with cutouts with powdered sugar. This works best when done before assembly to avoid covering the jam window.

Take a whole cookie (without a cutout) and spread a heaping teaspoon of raspberry jam on the flat side. Gently place a dusted cookie with a cutout on top, pressing lightly to create a sandwich. Repeat with remaining cookies until all are assembled.

The result is a beautiful cookie with jam peeking through the decorative window, reminiscent of the famous Linzer torte from which they get their name.