Directions

1. In a bowl, add flour, hazelnut powder, sugar, a pinch of salt, and egg and mix gradually adding in butter. Once the dough forms a ball, stop kneading. Another option is placing all the ingredients in the bowl of a food processor and pulsing until the dough starts forming a ball. Cool for 2 hours.
2. Preheat oven to 425 degrees Fahrenheit.
3. Roll out the dough on a floured surface. Using cookie cutters, cut the dough into strips. Arrange the cookie dough on a baking sheet covered with parchment paper. Mix the egg yolk with a tablespoon of water and brush the cookies with this mixture. Cook about 5 to 10 minutes until lightly browned.
4. Spread a little bit of jam on half of the cookies and cover them with the remaining cookies. Sprinkle with icing sugar or serve as is.
5. Vary the recipe by substituting the hazelnut powder with almond or walnut powder.