In a bowl of a stand mixer fitted with a paddle attachment, add 8 tablespoons butter, 1.25 cup einkorn flour, 1/2 cup almond flour and 1/2 cup powdered sugar.

Mix on low speed until it resembles wet sand (small clumps start to form).

Add 3 egg yolks and 1 teaspoon vanilla. Mix until dough starts to come together.

Knead-roll the dough into a ball. If the dough is too wet, sprinkle some flour on your work surface.

Cool covered dough in refrigerator for 30 minutes. Then roll the dough out thinly, 1/8 - 1/4" and cut out cookies. Gather the remaining dough again into a ball, and roll it out. Repeat until all dough is gone.

Bake at 325ºF for 10 minutes. The cookies might look underdone but they will turn perfect after they cool down on a rack.