This creamy mushroom soup is a classic comfort food that can be easily made using a food processor. It starts with sautéing onions and garlic, then adding sliced mushrooms and cooking until they are tender. The mixture is then pureed in a food processor until smooth and creamy. To enhance the flavor, you can add herbs like thyme or rosemary, and finish it off with a drizzle of truffle oil. Serve this delicious soup with crusty bread for a satisfying meal.