Cut mushrooms into ¼ inch slices. Roughly chop onions into ¼ inch dice.
In a large sauté pan, heat the oil on medium-high heat.
Add mushrooms and onion and cook until mushrooms are tender, and onions are translucent. Add garlic and cook an additional 3 minutes or so.
Add flour and mix until incorporated. Add vegetable broth, soy sauce, thyme and evenly mix.
Once sauce starts to thicken, add the sour cream and mix. Season with salt and pepper.
Cover and set aside on low heat.
In a large pot, bring water to a boil. Add ravioli and cook per directions, about 3 minutes.
Remove ravioli from water and add to the mushroom sauce.
Place ravioli on plates and coat with mushroom sauce. Top with fresh parsley and thyme.