Apple Dutch Baby

Preparation

1. Apple cider syrup:

   Step 1

   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.

   Step 2

   Do ahead: Syrup can be made 1 week ahead. Let cool; cover and chill. Bring to room temperature before using.

2. Dutch baby:

   Step 3

   Preheat oven to 425°F. Whisk eggs, milk, flour, vanilla, salt, and 1/2 teaspoon cinnamon in a medium bowl until smooth.

   Step 4

   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.

   Step 5

   Cook, tossing often, until apple is coated and softened, about 4 minutes. Transfer to a plate.

   Step 6

   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.

   Step 7

   Serve drizzled with apple cider syrup.