In a bowl, combine flour, grinder chestnuts, sugars, spices and salt, then gradually add diced butter and marzipan paste to obtain a smooth dough. Cover with plastic wrap and chill for 30min-1hr in the fridge, until firm.
Preheat oven on 300-325F
Roll out the dough (1cm thick). Cut out round cookies with a cookie cutter. Arrange on parchment-lined baking sheet.
Whisk the egg yolk with 1 tbsp of water and coat the cookies with egg yolk. Sprinkle with a little bit of sugar
Bake for 18-20 minutes. The middle should still be soft when you take them out of the oven.