Warm a little oil in a saucepan over a medium heat. Add the herbs and garlic and cook and stir for a minute or two. Add mushrooms and onion and continue to cook for about 5 minutes. Stir in the mushroom sauce.
Cook veg steam bag in microwave for 3 minutes according to the instructions on the packet; once veg is done add to pan with onions. Put rice in microwave and cook for 3 minutes then add to the saucepan. Stir everything through then serve.