Add the butter and powdered to a large mixing bowl. Beat with a hand mixer or a stand mixer fitted with the paddle attachment just until the ingredients are combined.
Add in the egg yolk and almond extract and beat until just combined.
Add in the flour, almond flour, and salt. Beat just until a cohesive dough forms.
Form the dough into a square and tightly wrap it in plastic wrap. Transfer the dough into the fridge to chill for 30 minutes.
Once the dough has chilled, remove it from the fridge and place it on a clean, floured work surface.
Roll the dough out until it is ¼" thick. Use a 2" linzer cookie cutter to cut out the cookies.
Gather the scraps of dough and re-roll to ¼" thick, and cut out more cookies. Repeat 1 more time.
To half of the cookies, cut out a little flower design in the middle.
Carefully transfer all of the cookies to a cookie sheet that is lined with parchment paper. Place the sheet in the freezer to chill for 10 minutes, while you preheat the oven to 350°F / 175°C
Once the cookies have chilled and the oven is preheated, bake them for 10-12 minutes, or until the cookies no longer look wet.
Let the cookies fully come to room temperature before assembling them.
For reference: the cookies that have no design stamped out are your bottom cookies, and the cookies with the design are your top cookies.
Arrange all of the top cookies on a tray and give them a dusting of powdered sugar.
Flip all of the bottom cookies upside down. Dollop 1 ½ tsp. of Stonewall Kitchen Apricot Jam into the middle of each cookie, then top it off with the top cookie.
Serve and enjoy!
Notes
Store the cookies in an airtight container in the fridge for up to 1 week.