# Ingredient List:
→ Wet Ingredients
01 - 1/2 cup active sourdough starter, unfed or discard
02 - 1/2 cup buttermilk, room temperature
03 - 1/4 cup unsalted butter, melted
04 - 2 large eggs, room temperature
05 - 1 teaspoon vanilla extract
06 - Zest of 1 lemon
07 - 2 tablespoons fresh lemon juice
→ Dry Ingredients
08 - 2 cups all-purpose flour
09 - 3/4 cup granulated sugar
10 - 1 1/2 teaspoons baking powder
11 - 1/2 teaspoon baking soda
12 - 1/2 teaspoon fine sea salt
→ Mix-Ins
13 - 1 cup fresh blueberries, or frozen unthawed
→ Lemon Glaze
14 - 1 cup powdered sugar
15 - 2 to 3 tablespoons fresh lemon juice
16 - 1 teaspoon lemon zest
# Directions:
01 - Preheat oven to 350°F. Lightly grease two nonstick donut pans.
02 - In a large bowl, whisk together sourdough starter, buttermilk, melted butter, eggs, vanilla extract, lemon zest, and lemon juice until well combined.
03 - In a separate bowl, whisk together flour, sugar, baking powder, baking soda, and salt.
04 - Add dry ingredients to wet mixture and stir gently until just combined, avoiding overmixing.
05 - Fold in blueberries, lightly dusting them with flour if desired to prevent sinking.
06 - Spoon or pipe batter into prepared donut pans, filling each about three-quarters full.
07 - Bake for 13 to 15 minutes, or until donuts spring back when lightly pressed and a toothpick inserted comes out clean.
08 - Let donuts cool in pans for 5 minutes, then transfer to a wire rack to cool completely.
09 - Whisk powdered sugar, lemon juice, and zest in a small bowl until smooth.
10 - Dip cooled donuts into glaze and allow to set on a rack.