1. In saucepan, cook mushrooms, broth and thyme until mushrooms are tender.
2. Blend mixture in blender, leaving some chunks of veggies in it. Set it to the side.
3. In saucepan, melt the butter, and whisk the flour until smooth. Add salt and pepper, rice milk and mushroom puree. Stirring consistently, bring to a boil and cook until thickened. Adjust seasoning to individual taste, and add sherry.