Mango-Banana Cake

Ingredients

• Cake
• 2 cups flour
• 1 tablespoon cornstarch
• 1 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 1/4 teaspoon ground nutmeg
• 1/2 cup unsalted butter, room temp
• 1 large egg yolk
• 1 cup sugar
• 2 large eggs
• 1/3 cup sour cream
• 1 teaspoon vanilla extract
• 1 cup mashed, ripe banana
• Cream Cheese Frosting
• 3 (8 ounce) packages cream cheese, room temp
• 6 tablespoons unsalted butter, room temp
• 1 1/2 teaspoons vanilla extract
• 2 1/2 cups powdered sugar
• Mango Curd
• 15 ounces ripe mangoes
• 1/2 cup sugar
• 3 tablespoons fresh lemon juice
• 1 pinch salt
• 4 large egg yolks
• 1/4 cup unsalted butter, cut into small pieces
• Garnish
• mango, peeled,pitted,thinly sliced
• fresh mint sprig