In a large mixing bowl, combine the cooled browned butter, brown sugar, and granulated white sugar. Using an electric mixer on medium speed, cream together for approximately 2 minutes until the mixture is well combined. It'll be a bit crumbly, that's okay!
1 (200g) cup granulated white sugar, 1 (200g) cup brown sugar
Add the reduced apple cider, egg, egg yolk, vanilla, and sourdough discard to the sugar butter mixture.
⅓ (80g) cup apple cider reduction, 1 large egg, 1 large egg yolk, ⅓ (80g) cup sourdough discard, 1½ tsp vanilla extract
Mix all of the wet ingredients on LOW until just combined.
In a separate bowl, whisk together the flour, cream of tartar, baking soda, cinnamon, nutmeg, cardamom, and salt.
3 (350g) cups all-purpose flour, 2 tsp cream of tartar, 1 tsp baking soda, 2 tsp ground cinnamon, ¼ tsp ground nutmeg, ⅛ tsp ground cardamom, ¾ tsp fine sea salt
Mix the dry ingredients into the wet ingredients on low just until no dry streaks remain. Avoid overmixing the cookie dough or the cookies will get tough.
Using a 2-ounce cookie scoop (approximately 4 tablespoons or 70g balls), portion out your cookie dough and roll into balls. Transfer to a parchment lined baking sheet, and cover with plastic wrap. Transfer to the refrigerator to chill.
Chilling of this dough is key to a a perfect cookie; make sure you chill the cookies at least 2 hours before you bake them for the best results.
Overnight Fermentation Option: For optimal fermentation, consider chilling the dough overnight. If chilling overnight, allow the dough balls to rest at room temperature for about 20 minutes before proceeding with baking as listed below.