Pour the milk and vanilla into a small saucepan.
In a small bowl, whisk together the cornstarch, tapioca starch, sugars, nutritional yeast, salt and turmeric. Then whisk in about 1 tbsp of the milk until no lumps remain, and pour it all into the saucepan.
Place over medium heat and stir constantly until it thickens. If you stop stirring for a few seconds it should bubble. Then pour it over the caramel in the ramekins.
Cover the surface with cling film to prevent a skin from forming, and place them in the fridge to set and let the caramel dissolve. At least 6 hours (at which point there might still be some hard caramel at the bottom) or preferably overnight.
Then to serve, run a knife around the top edge to release it, place a plate upside down over the ramekin and flip them both together to turn it out. You might need to give it one good shake (with the plate still secured under it) for it to release.