Peel 2 medium sweet potatoes.
Chop peeled sweet potatoes until you have 1 1/2 cup’s worth
Boil the sweet potatoes until soft.
In a heavy saucepan over medium-low heat, cook 1 tablespoon flour and 1 tablespoon unsalted butter, stirring constantly until it achieves a light caramel color.
Add 1 1/2 cup chicken broth and 1 tablespoon light brown sugar. Bring to a boil and then lower to a simmer.
Stir in sweet potatoes, 1/4 teaspoon ground ginger, 1/8 teaspoon cinnamon, and 1/8 teaspoon nutmeg. Bring to a simmer and cook 5 minutes more.
Puree the soup and return to the saucepan.
Add 1 cup milk and salt and pepper to taste.
Serve warm, refrigerate leftovers.