Preheat the oven to 350°F (177°C). Prepare two six-cavity silicone or metal donut pans or muffin pans by greasing the cavities with the oil.
In a small bowl, mix together the chia seeds and water to make a chia egg. Let the chia egg set for 5 minutes.
Grab a high-powered blender and place the oats in the blender. Blend the oats for 20 seconds, until you get a powder. Add the chia egg, zucchini, sugar, almond butter, bananas, baking soda, cacao, salt, vanilla and ½ cup (85 g) of the chocolate chips.
Blend the ingredients for about 1 minute, until you get a smooth batter. Pour the batter in each donut cavity until it evenly hits the top of the cavity. Top the donuts with the remaining ½ cup (85 g) of chocolate chips.
Bake the donuts for 15 to 18 minutes. If you are making muffins, bake them for 18 minutes. You’ll know they are done when you press on the top of a donut and it bounces back and doesn’t sink in.
Immediately remove the donuts from the pans by flipping each pan upside down onto a plate or the countertop. Transfer the donuts to a wire rack to cool.