Wash your orange and zest the amount needed for the muffins. Slice orange and then remove the juice and set aside for the muffins.
In a large mixing bowl add the sugar, sourdough discard, sour cream, milk, vanilla extract, avocado oil, melted butter, eggs, orange juice and orange zest. Whisk ingredients together until blended.
1 cup (200g) white granulated sugar, ½ cup (120g) sourdough discard, ⅓ cup (80g) full-fat sour cream or whole milk Greek yogurt, ¼ cup (60g) milk or buttermilk, ½ cup (120g) fresh orange juice, 4 tbsp (60g) unsalted butter, melted, ¼ cup (60g) avocado oil, 2 eggs, 2 tsp vanilla extract, 1 tbsp (8g) orange zest
In a separate bowl, whisk together the flour, baking powder, baking soda, cardamom and salt.
3¼ cups (400g) all-purpose flour, 2½ tsp baking powder, ½ tsp baking soda, ¾ tsp salt, ⅛ tsp ground cardamom
Add the dry ingredients to the wet, whisking together until no streaks remain. It's important to not overmix the batter, as this will make the muffin tough.
Overnight Ferment Option: At this point you have the choice to ferment the batter overnight. If fermenting the batter overnight, cover the bowl with plastic and transfer to the refrigerator overnight.
If you're batter was fermenting in the refrigerator overnight, allow to rest at room temperature for an hour to warm up. Skip this step if you aren't fermenting the batter overnight. .
The next step is to fold in the cranberries. I personally like to use fresh for the amazing flavor, but I will give you directions on frozen and dried too below depending on your needs.
1 1/2 cup (150g) cranberries
Adding fresh cranberries: Cut cranberries in half, then add to the batter and fold into the muffin batter.
Adding frozen cranberries: Weigh out frozen cranberries and allow to rest in a bowl of warm water to thaw. After 5-10 minutes, strain cranberries from water and transfer to a bowl lined with a paper towel to absorb any excess moisture (you can also just strain and blot). After water has been absorbed, remove the paper towel and toss the cranberries in 2 Tablespoons of flour to prevent sinking. Add cranberries to the muffin batter, gently folding into the muffin batter until distributed evenly.
Adding dried/freeze-dried cranberries: weigh and add directly to the batter, folding into the batter until evenly distributed.