Preheat the oven to 180°C/350°F (fan-forced) and line a muffin tray with patty cases or baking paper.
In a small jug, mix the milk and apple cider vinegar and allow to sit while you mix the dry ingredients. If you're using a Thermomix 5 seconds, speed 5.
In a mixing bowl combine the flour, coconut sugar, cacao powder, bicarb and baking powder. Whisk together until there are no lumpy bits. (I usually just sit a regular mixing bowl on the Thermomix to weigh the dry ingredients).
Add the oil and vanilla to the milk and mix, then pour over the dry.
Add the hot water (or hot coffee) and then whisk to just combine. If you're using a Thermomix 10 seconds, speed 3 (scraping the sides).
Spoon into patty cases or the lined muffin tray.
Bake for 15-20 minutes or until a skewer inserted comes out clean.
To avoid crumbling, it’s important not to overcook them. Check at 15 minutes, then continue checking every minute or two until they’re just cooked through.
Cool on a wire cooling rack.