Step 1

In a large bowl of a stand mixer fitted with the whisk attachment, whisk the eggs on medium-high speed until nice and frothy (about 3-4 minutes). Slowly add sugar. Continue to whisk until well combined and slightly thickened. The mixture will be pale yellow and light.

Step 2

Add the milk, butter, melted chocolate, vanilla extract, and zest (if using). Mix until well combined. Remove the bowl from the stand mixer.

Step 3

Sift in the dry ingredients (flour, cocoa powder, baking powder, salt, and spices) over the mixture of wet ingredients and mix with a wooden spoon or rubber spatula until well combined. At this point, the dough will be soft.Cover and refrigerate for 30 minutes.

Step 4

Meanwhile, preheat the oven to 350 degrees F. Line baking sheets with parchment paper.

Step 5

Take the dough out of the fridge and scoop the dough with medium-sized cookie scoop. Roll the dough into a ball with floured hands.

Step 6

Roll each dough ball into a smooth ball and then roll in a small bowl of powdered sugar (icing sugar). Place on baking sheet about 2 inches apart. Continue to roll until all of the dough is used.

Step 7

Bake for about 10 minutes or until firm to the touch. Transfer to wire racks to cool completely. Enjoy slightly warm, or room temperature.