@Thebratdragon
If you're allergic to mushrooms, you can do the similar by replacing the mushrooms with lentils. Especially green, black, brown types that will keep more structure. Give them some cooking time and have a kettle of boiled water handy (or steal from your pasta pan etc) as the lentils will need a bit of time to swell up with enough available liquids, tamari spices etc before you add the veggies at end.