Preheat your oven to 350℉. Grease a 9 x 13 inch cake pan, then line it with parchment paper and set aside.
To a medium bowl, add the almond flour, tapioca flour, baking soda, baking powder, salt, cinnamon, ginger, and cloves. Whisk to combine and set aside.
214 g almond flour, 56 g tapioca flour, 1 tsp baking soda, 1/2 tsp baking powder, 3 g salt, 1 ½ tsp ground cinnamon, 1 ½ tsp ground ginger, 1/4 tsp ground cloves
To a large mixing bowl, add the sourdough starter, yogurt, eggs, maple sugar, avocado oil, and vanilla extract. Use a hand mixer on medium speed to mix until fully combined.
100 g grain-free sourdough starter, 69 g plain yogurt, 4 large eggs, 226 g maple sugar, 119 g avocado oil, 2 tsp vanilla extract
Add the dry ingredients to the wet ingredients and continue mixing on low speed until just combined. Stir with a rubber spatula to make sure no dry flour remains in the bowl.
Pour the batter into the prepared pan and bake on the middle rack for 35 minutes or until a tooth pick comes out clean when inserted in the middle of the cake.
Place on a wire rack and let cool completely in the pan.