Preheat the oven to 425ºF. Prep a muffin pan with liners.
In a medium sized mixing bowl, add the sourdough discard, honey, and milk. Stir with a dough hook or whisk until smooth. Stir in the vanilla, avocado oil, lemon zest and egg.
Add the flours, baking soda, cinnamon, cardamom powder and salt. Stir until just combined. Gently fold in the blueberries.
Scoop the batter evenly into the cups. Top with hemp seeds.
Bake for 20 to 25 minutes or until light golden brown. Cool on a cooling rack to Enjoy!