Preheat your oven to 400℉ and line a 12 cup muffin pan with parchment baking cups.
Add the starter, yogurt, avocado oil, vanilla extract, and maple sugar to a medium sized mixing bowl. Whisk well to combine.
100 g sourdough discard, 225 g plain yogurt, 75 g avocado oil, 1 tsp vanilla extract, 100 g maple sugar
Add the buckwheat flour, baking powder, baking soda, and salt. Combine with a rubber spatula until no dry flour remains in the bowl.
100 g buckwheat flour, 1/4 tsp baking powder, 1/4 tsp baking soda, 2 g salt
Add the chocolate chips and fold in with your rubber spatula. Optionally, you can cover and place the bowl in the fridge for up to 24 hours.
128 g chocolate chips
Use a 3.4 tablespoon muffin scoop to add the batter to the holes of the muffin pan. Place in the oven and bake for 20-25 minutes until lightly browned. Cool in the pan for 5 minutes and then transfer the muffins to a wire rack.