Apple Cinnamon Dutch Baby

Ingredients

• 1 large Granny Smith apple
• 4 tablespoons (1/2 stick) butter, divided
• 2 tablespoons sugar, divided
• 1/4 teaspoon ground cinnamon
• 1/2 cup whole milk
• 2 extra large eggs, at room temperature
• 1/2 teaspoon pure vanilla
• 1/2 cup all-purpose flour
• 1/4 teaspoon kosher salt
• Powdered sugar
• Pure maple syrup to serve