This Pumpkin Soup with Sage Browned butter is silky smooth with a deep, nutty flavor from browned butter and crispy sage leaves. The sweetness of the pumpkin balances with the toasty richness, making it perfect for serving with crusty bread or a warm biscuit.
In a large saucepan, heat the butter until melted. Add the sage and cook until butter is browned and sage is crispy. Add the onion and cook, for 7 minutes, until the onion is softened.
In a small mixing bowl, whisk together the flour and ¼ cup of the chicken broth, set aside. Add the flour mixture, the remaining broth, pumpkin, salt, and ¼ teaspoon of the red pepper to the onion mixture.
Bring the soup to a boil, whisking constantly. Reduce the heat and simmer for 5 minutes, stirring occasionally.
To serve, sprinkle with chives and the remaining red pepper flakes (if using).