Add your hot coffee to a large mug then add the cocoa powder, cacao butter, coconut oil and erythritol. Stir well to melt the fats and dissolve the sweetener. Carefully use a handheld stick blender or milk frother and blend the fat and coffee until smooth and creamy.
Add the almond milk to a small saucepan and set over low/medium heat. Gently warm the milk until it is piping hot through and tiny bubbles start to appear on the surface. Remove the milk from the heat then carefully use a handheld stick blender or milk frother to blitz the milk until almost doubled in volume and is light and foamy.
Carefully pour the hot frothy milk into the center of the blended coffee. The milk will sink to the bottom of the mug leaving a light layer of froth on the surface. Optionally you may dust the milk foam lightly with a little cocoa powder then serve hot.