Line the bottom of your Slow Cooker with greased parchment paper.
Whisk the egg, oil, vanilla, and Stevia in a bowl.
Add the almond butter and stir well.
Add the almond flour, baking powder, and baking soda, salt, and cocoa powder; stir until combined well.
Add shredded zucchini and stir again.
With your hands knead the batter until rough combined.
Pour the almond-zucchini mixture into Slow Cooker.
Close the lid and cook on HIGH for about 2-3 hours.
Let cool for 5 minutes, slice and serve warm.
Bon Appétit!