Ultimate Sweet Potato Casserole

Bahan-bahan (4 porsi)

• 3 sweet potatoes (about 2 lbs)
• 2 tablespoons brown sugar
• 1/4 cup maple syrup
• 3 egg yolks (whites reserved)
• 1/2 teaspoon salt
• 4 tablespoons unsalted butter, softened
• 1/2 cup evaporated milk
• 1 teaspoon vanilla extract
• 1/4 cup brown sugar
• 3 tablespoons flour
• 3 tablespoons unsalted butter, cold
• 1/3 cup chopped pecans
• 3 egg whites
• 1/4 teaspoon cream of tartar
• 3/4 cup granulated sugar
• 1 teaspoon vanilla extract
• 3/4 cup marshmallow fluff