
Because this is a slice-and-bake cookie, you can freeze the dough, if wrapped airtight, for up to two months. You don’t even need to defrost before slicing and baking, which means you can produce a spontaneous midnight snack that’s as easy as it is impressive.

In a medium bowl, combine the all-purpose flour, light rye flour, baking soda, baking powder, salt, and cocoa powder. Set aside.
In a large bowl, with a hand mixer, beat together the butter and brown sugar until light and fluffy, about 3 minutes. Beat in the egg yolks, one at a time, and the vanilla. Gradually stir in the flour mixture until combined. Fold in the pistachios.
Divide the dough in half. Roll each half into a log, about 2 in [5 cm] wide by 10 in [25 cm] long. Wrap the logs tightly in plastic wrap and refrigerate for at least 30 minutes, or freeze for up to 2 months.
Preheat the oven to 350°F [180°C]. Line two baking sheets with parchment paper.
Remove the dough from the refrigerator. (If the dough has been in the freezer, let it sit at room temperature for 15 minutes.) Unwrap the dough and cut it into ½-in [12-mm] slices. Set the dough slices on the prepared baking sheets, leaving 1 in [2.5 cm] between the cookies. Sprinkle each cookie with fleur de sel.
Bake for 11 to 13 minutes, or until the centers appear set. Transfer the cookies to a wire rack and let cool for 10 minutes. Store in an airtight container at room temperature for up to 1 week.
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