Sweet Potato Casserole with Marshmallows - Crystal Sugar

Ingredients

• 4 pounds sweet potatoes, peeled and cubed
• 1/4 cup packed Crystal Sugar Dark Brown Sugar
• 6 tablespoons unsalted butter, softened
• 1 egg, lightly beaten
• 1 1/2 teaspoons ground cinnamon
• 1 teaspoon vanilla extract
• 1/2 teaspoon salt
• 1 cup half and half, divided
• 1 cup chopped pecans, divided
• 2 cups mini marshmallows