Cut the onion, garlic, and mushrooms into bite-sized pieces.
Heat olive oil in a pan and sauté the onion and garlic.
Add the mushrooms and continue to sauté to bring out their aroma.
Add the rice and stir-fry together with the other ingredients.
Pour in the soy milk and simmer slowly over medium-low heat.
Season with salt and pepper.
When the rice is tender and the mixture has thickened to your liking, it's done.