Peel the onion, clean the peppers and mushrooms and cut into bite-sized pieces.
Sweat the onions in a saucepan, then add the peppers and mushrooms and the whole thing is cooked firm to the bite. Deglaze with the tomatoes and the broth and simmer for 5 minutes. Then stir in the soy yoghurt and season with salt and pepper. Put everything in a baking dish, sprinkle with the yeast melt and put in the oven at 200 ° C top / bottom heat for 30 minutes.