Sift together the powdered sugar, flour, and cardamom into a large bowl or the bowl of your stand mixer fit with the paddle attachment.
Add the yolks, oil, and rose water. Turn the hand or stand mixer up to medium speed and mix the ingredients for 5 minutes, not less. Scrape the sides of the bowl halfway through and at the end.
Refrigerate the dough for at least 2 hours, and preferably overnight.
Once the dough has chilled, roll the dough into 1.5-teaspoon-sized balls and place on a parchment or silicone-lined baking sheet (12 cookies per quarter sheet pan, 24 cookies per half sheet pan).
Gently press the centers of each ball with your thumb or a small spoon to create an indentation. Then, sprinkle a small number of poppy seeds in the center of each cookie.
Pop the cookies in the refrigerator while you preheat the oven to 350F.
Bake for 13-18 minutes. These cookies stay white in color, so don’t try to brown them. They are ready when they slide easily off the baking sheet.
Allow the cookies to cool on the baking sheet.
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Notes
These cookies are meant to be crumbly, not as you’re preparing them, but after they are baked.This dough makes 48 cookies, so feel free to freeze the rolled dough balls on a baking sheet, then transfer them to a zipper bag or similar once frozen.Do not substitute the rose water for rose extract as this will be overpowering. Do not use more rose water than suggested in the recipe or the cookies will dry out and crack.Store these cookies in an airtight container at room temperature for 3 days, in the refrigerator for 1 week, or in the freezer for up to 3 months.