01 -
Pulse hazelnuts, sugar, matzo cake meal or flour, and salt in a food processor until finely ground, ensuring not to form a paste. Transfer to a bowl and mix in melted butter, egg, and vanilla extract until combined. Chill dough, covered, for about 30 minutes.
02 -
Position the oven rack in the middle and preheat to 350°F (175°C).
03 -
Drop level tablespoons of dough 1 inch apart onto two baking sheets lined with parchment paper. Roll each portion into a ball and chill for another 10 minutes until firm.
04 -
Press a piece of chocolate firmly into the top of each dough ball. Bake one sheet at a time for 10 to 12 minutes or until tops are pale golden and undersides are golden. Avoid overbaking. Transfer to a wire rack and cool completely.
05 -
For jam-filled cookies, after the additional 10-minute chilling period, use your thumb, index finger, or the rounded end of a wooden spoon to create a 1/2-inch-wide, 1/3-inch-deep indentation in each cookie. Fill each indentation with 1/4 teaspoon of jam before baking.
06 -
Substitute the hazelnuts with 3/4 cup sliced almonds, proceeding with the recipe as instructed for an almond variation.
07 -
Store cookies in an airtight container at room temperature for up to 3 days.