This gourmet cream of mushroom soup has a creamy base with plenty of sliced mushrooms throughout. If you prefer a smooth soup, puree the soup to your desired texture. If fully pureeing, you might need to add a little extra chicken broth to thin.
In a large heavy bottomed pot or Dutch oven, melt butter until foaming subsides. Add onion and cook until soft but not browned, about 5-8 minutes. Add mushrooms and 1/2 teaspoon each kosher salt and black pepper.
Add flour and stir to coat the mushroom mixture. Cook for 1 minute. Add sherry and cook for an additional minute, scraping any brown bits from the bottom of the pot.