Chocolate Marble Cake

Ingredients

• Cake:
• Baking spray with flour
• 1 2/3 cups all-purpose or cake flour
• 2/3 cup whole-wheat pastry flour
• 1 1/2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1/4 teaspoon salt
• 1 cup plus 1 tablespoon sugar, divided
• 1 cup light sour cream
• 1/2 cup plain almond milk
• 1/2 cup applesauce
• 1/3 cup melted unsalted butter
• 2 eggs
• 2 egg whites
• 1 1/2 teaspoons pure vanilla extract
• 1 ounce unsweetened chocolate, melted
• 1 tablespoon unsweetened cocoa powder
• Glaze:
• 1/2 cup powdered sugar
• 1 tablespoon melted unsalted butter
• 1 tablespoon warm water
• 1 tablespoon unsweetened cocoa