Heat the olive oil in a saucepan over medium heat. Add in the onion and sauté in the olive oil until soft.
Add in the sliced mushrooms and sauté for about another 5 minutes or so until the mushrooms soften.
Sprinkle the flour over the onion and mushrooms and continue to cook and stir for about 3 minutes.
Stir in one cup of soy milk until smooth. Allow the gravy to thicken and then stir in the remaining soy milk and season with salt, pepper, and dried thyme.
Reduce the heat to medium low and allow everything to simmer until thickened to your desire, about 10 minutes.
Serve warm over mashed potatoes or cauliflower
Notes
- If the gravy is too thick, add in some boiling water or tap water to thin it out. If it's too thin, simply keep it on the heat a little longer to reduce.