For the pistachio snowball cookies, blend pistachios ¾ cup (110g) at a time into a texture that resembles almond flour. You want to stop the blender before it starts to clump. If you miss it and it clumps a little bit that’s okay too, just don’t keep going. This texture happens really fast, like 5-10 seconds depending on the power of your blender, so don’t walk away.
Empty the pistachio flour into a medium sized bowl. To that bowl, add the rest of your dry ingredients: flour and baking powder. Give the dry ingredients a whisk or stir with a fork and set them aside.
Whip the butter at medium speed, until it gets lighter in color and visibly increases in volume (about 3-5 minutes). Add in the confectioner’s sugar (icing sugar) a little bit at time to keep it from puffing in your face. Once the sugar is all in, let that combine for another 2-3 minutes. At this point add in the egg, almond extract, and the vanilla extract. Let the mixer go until the egg and extracts have fully incorporated into the creamed butter and sugar, another 2-3 minutes. The whole mixture should look like a thick batter with a lot of air whipped in.
Now it’s time to add in the dry ingredients set aside earlier. Turn your mixer down to medium low and incorporate the flour mixture in 3-4 batches. As soon as the flour mixes in, stop the machine. Do NOT overmix. The dough should be very soft, light, and moist. If you overmix the dough it will toughen and make the cookies dense.
Scoop out the cookies and chill the dough for 20 minutes. Work in batches of 4-6 cookies at a time. It’s important to keep everything as chilled as possible, as there is a lot of butter in the cookie and your hands and the room temperature air will soften them very quickly.
Pick up a dough scoop and push a core into the center of the dough making a bowl shape. There should be enough dough protruding around the core that you can fold it over the filling. Gently roll your stuffed cookie into a ball with your hands and set it back onto the lined baking sheet in the refrigerator. YOU WILL GET MESSY. Sorry, but it’s worth it! Repeat until all the cookies are done and organized on the tray.
Leave the tray in the refrigerator so the cookies can chill a bit before baking. While they are chilling, turn your oven to 350°F (177°C). After preheating, move 13 cookies (alternate rows of 2 and 3) to a separate lined baking sheet. Bake the cookies for 8-10 minutes. The edges will just start to color and the tops should look dry when they are ready.
Take the cookies out of the oven and let them cool for 5-10 minutes. Set out a cooling rack over a large rectangle of parchment paper and add at least 1 cup (110g) of powdered sugar to a bowl. When the cookies can be picked up without crumbling but are still slightly warm. Add them, one-at-a-time, to the sugar and roll to coat.
Set the coated cookies onto the cooling rack to free up the backing tray and start the second batch of cookies.
This recipe makes 32-36 cookies, so if you want to bake 3 trays of cookies at once to speed things up, feel free!