METHOD
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cookie dough
Add flour, ground almonds, powdered sugar, vanilla paste, softened butter cut into cubes, and egg yolks to a stand mixer bowl fitted with a paddle attachment. Or use a bowl and an electric mixer. Mix for 2 - 3 minutes over low heat, then knead into an even cookie dough using your hands. Wrap in clingfilm or add to a freezer bag. Set aside to room temperature for 40 - 60 minutes or make up to a day ahead and store in your fridge. In that case, take the cookie dough from the fridge 30 minutes before baking. Set a rack in the middle of the oven and preheat it to 200 °C / 390 °F.
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shape
Shape the dough into small balls, each weighing approximately 12g (0.5 ounces). Place them on a baking sheet lined with parchment paper, making sure there's enough space between them. Use the end of a wooden spoon to gently press an indent in the center of each cookie. Place in the preheated oven and bake for 10 minutes at 200 °C / 390 °F. When the cookies are baked, transfer them to a wire rack to cool.
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fill and serve
Optionally, dust your cooled cookies with powdered sugar. Fill the cookies with your favorite jam or marmalade. Use a small teaspoon or a pastry bag. If your marmalade is too thick, add it to a saucepan and heat over medium heat for a minute to get a more liquidy texture.