Sweat the onion in the butter until softened. Add mushrooms and cook, stirring until they begin to release their liquid. Add Madeira, stock and milk. Bring to a simmer. Combine half-and-half with flour, then whisk in. Add seasoning. Puree until smooth. Beat cream with salt to peaks. Hold chilled.
Pour 2/3 cup hot soup into a blender. Blend on high for 5–10 seconds. Top with a dollop of cream. Serve immediately.
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