Grind the oatmeal in a food processor or coffee grinder until finely ground for easier mixing into the dough.
In a bowl, combine the flour, ground oatmeal, baking powder, and vanilla sugar.
Melt the butter, then mix it with the sugar in a bowl. Add the egg yolk and mix until smooth.
Mash the chestnut puree with a fork and add it to the dough. Mix well to combine.
Refrigerate the dough for at least 30 minutes to make it easier to roll out.
On a lightly floured surface, roll out the dough to about 3 mm (⅛ inch) thick, then cut out circular shapes. Cut out the center of half of the circles with a smaller cutter.
Place the linzer cookies on a baking sheet lined with parchment paper and bake in a preheated oven at 350°F (180°C) for 8-10 minutes, or until lightly golden brown.
Let the linzer cookies cool completely, then spread jam on the whole circles and top with the circles with the cut-out centers.
Before serving, dust with powdered sugar.
To provide the best experiences, we and our partners use technologies like cookies to store and/or access device information. Consenting to these technologies will allow us and our partners to process personal data such as browsing behavior or unique IDs on this site and show (non-) personalized ads. Not consenting or withdrawing consent, may adversely affect certain features and functions.
Click below to consent to the above or make granular choices. Your choices will be applied to this site only. You can change your settings at any time, including withdrawing your consent, by using the toggles on the Cookie Policy, or by clicking on the manage consent button at the bottom of the screen.