Good-Cooking - Apple Skillet Cake

Ingredients

• 3 large eggs
• 3/4 cup all-purpose flour
• 2 tablespoons granulated sugar
• 3/4 cup milk
• 1 teaspoon cinnamon
• 1 teaspoon vanilla extract
• 2 cups thinly sliced tart green apples
• 1/4 cup unsalted butter
• Maple syrup, if desired