Apple-Oat Upside-Down Cake

Ingredients

• 3/4 cup quick-cooking oats
• 3/4 cup warm apple juice
• 2 tablespoons vegetable oil
• 1/4 cup egg substitute or 2 large egg whites
• 2 teaspoons vanilla extract
• 1 tablespoon butter or stick margarine, melted
• Cooking spray
• 1 cup packed brown sugar, divided
• 1 large Granny Smith apple, peeled and thinly sliced (about 1 1/2 cups)
• 1 1/4 cups all-purpose flour
• 1 teaspoon baking soda
• 1 teaspoon ground cinnamon
• 1/2 teaspoon salt
• 1/4 teaspoon ground nutmeg