In a stand mixer or large mixing bowl, cream 113g (½ cup) softened butter, 150g (¾ cup) granulated sugar, and 50g (¼ cup) brown sugar together until light and fluffy (2–3 minutes).
Add in 60g (¼ cup) sourdough discard, 1 large egg, 1 tsp vanilla extract, and ½ tsp almond extract. Mix until well combined.
In a separate bowl, whisk together 220g (1 ¾ cups) all-purpose flour, ¾ tsp baking powder, ½ tsp baking soda, and ½ tsp salt.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Be careful not to overmix. If the dough feels too sticky or wet, add a bit more flour, one tablespoon (8–10g) at a time until you get a soft and scoopable dough.
Fold in 85g (½ cup) white chocolate chips (optional) and 50g (¼ cup) red and green Christmas sprinkles.
Scoop dough into 14-16 evenly sized balls (about 2 tablespoons or 40g each). Chill the dough balls for 30 minutes to 1 hour (up to 24 hours).
Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.
Place chilled dough balls on a lined baking sheet and bake for 10–12 minutes, or until edges are set and centers are slightly underbaked.
Add extra sprinkles and white chocolate chips on top of the cookies fresh out of the oven. Then, let cool on the baking sheet for 5 minutes before transferring to a wire rack.
Notes
If your dough feels wet or sticky after mixing, add a bit more flour, one tablespoon at a time. Sourdough discard can vary in hydration, so depending on how wet yours is, you may need a little extra flour to get a soft, scoopable dough.Dough balls can be frozen and baked straight from the freezer—bake at 375°F (190°C) for about 12 minutes.