Preheat your oven to 350°F.
Use a microplane to finely grate the zucchini. Then squeeze out all the excess liquid with a paper towel. The zucchini should be about 1/3 cup in size and 45 grams in weight after it's drained. Set this aside.
Blend your oats into fine oat flour, then mix together the oat flour, baking soda, salt and cinnamon.
In a small measuring cup, whisk together the almond butter, maple syrup, egg and zucchini.
Add the dry ingredients to the wet and whisk again.
In a small mug, ramekin or mini dutch oven, pour in the batter and top with the chocolate.
Bake at 350°F for 18-23 minutes or until the baked oats are completely risen.
Serve immediately!