Ingredient:

• 4 pounds sweet potatoes (about 5 large), peeled and cut into 1-inch pieces
• 1 cup 2% milk
• 6 tablespoons butter, softened
• 1/2 cup packed brown sugar
• 1 large egg
• 1-1/2 teaspoons ground cinnamon
• 1-1/2 teaspoon vanilla extract
• 3/4 teaspoon ground allspice
• 1/2 teaspoon salt
• 1/4 teaspoon ground nutmeg
• 10 large marshmallows, halved lengthwise