Step 1

Preheat oven to 400°F (200°C).

Step 2

Put butter in a 6.5" cast-iron skillet or small oven safe baking dish and place in the oven.

Step 3

In a medium bowl, whisk together egg, milk, vanilla, and sugar. Add flour, salt, and cinnamon and whisk vigorously to remove lumps. Set aside.

Step 4

Using oven mitts, carefully remove skillet from oven. Swirl butter around in skillet to coat completely.

Step 5

Add sliced apples to the skillet, then pour batter over the apples.

Step 6

In a separate small bowl, mix together 1 teaspoon of sugar and ⅛ teaspoon of cinnamon for the topping. Sprinkle over the top of the batter.

Step 7

Place the skillet back into the oven and bake until the pancake is puffed in the center and golden brown along the edges, about 20-25 minutes.

Step 8

Remove from the oven and use a spatula to transfer the Dutch baby from the skillet to a plate or cooling rack to cool 10 minutes.

Step 9

Enjoy warm.