Indulge in the creamy and decadent combination of mushrooms and brie cheese in this luxurious soup. This recipe features sautéed mushrooms simmered in a velvety broth enriched with brie cheese. The brie cheese adds a creamy and slightly tangy flavor that complements the earthiness of the mushrooms. The soup is further enhanced with the addition of onions, garlic, and thyme. Serve it with a drizzle of truffle oil and a sprinkle of chopped chives for an elegant and sophisticated dish that will impress your guests.