Apple Dutch Baby

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   ["Bring cider, butter, brown sugar, vanilla, and cinnamon to a boil over medium-high heat in a large saucepan. Reduce heat and boil gently, whisking occasionally, until thick and syrupy, 30-45 minutes.", "Do ahead: Syrup can be made 1 week ahead. Let cool; cover and chill. Bring to room temperature before using.", "Preheat oven to 425u00b0F. Whisk eggs, milk, flour, vanilla, salt, and 1/2 teaspoon cinnamon in a medium bowl until smooth.", "Melt 2 tablespoons butter in a 10"" skillet, preferably cast iron, over medium heat. Add apple and sprinkle with brown sugar and remaining 1/2 teaspoon cinnamon.", "Cook, tossing often, until apple is coated and softened, about 4 minutes. Transfer to a plate.", "Wipe out skillet and heat in oven until very hot, 8-10 minutes. Carefully add remaining 2 tablespoons butter to skillet, tilting to coat bottom and sides. Add apple to center of skillet; pour batter over. Bake until pancake is puffed and golden brown around the edges and center is set but still custardy, 12-15 minutes.", "Serve drizzled with apple cider syrup."]

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