Preheat your oven to 350 degrees F and line a 12 cup muffin pan with parchment liners.
Peel and chop the apple, cover and set aside.
To a large mixing bowl, add the gf sourdough starter, eggs, yogurt, maple syrup, avocado oil, and vanilla extract. Whisk well to combine.
74g grain-free or gluten-free sourdough starter, 3 large eggs, 20g plain yogurt, 100g maple syrup, 30g avocado oil, 1 tsp vanilla extract
Add the almond flour, baking soda, cinnamon, and salt. Stir to fully incorporate with a rubber spatula or wooden spoon.
168g almond flour, 3/4 tsp baking soda, 2 tsp ground cinnamon, 1/4 tsp salt
Fold in the chopped apples.
128g fresh apples
Use a muffin scoop to scoop the batter into the muffin pan.
Bake for 20 minutes, or until golden brown.
Let the muffins cool in the pan for 5-10 minutes and then transfer them to a wire rack. Store in the refrigerator for up to one week.