Preheat oven to 400 degrees F. 

Melt the butter in a 12” cast iron frying pan on medium heat. Brush some up the sides to prevent sticking.

Place the sliced apples in a nice pattern inside the skillet, let them sauté slightly while preparing the batter.

In a blender combine the flour, milk, salt, cinnamon, baking powder, sugar, and eggs. Stop the blender, scrape down the sides and bottom with a spatula then blend again just until completely combined. 

Pour the batter over the hot pan with the sauteing apples in the pan and quickly place the pan into the preheated oven. 

Bake for 20 - 25 minutes, without opening the oven, or until golden brown. 

Combine the powdered sugar and cinnamon for the topping and sprinkle over baked Dutch baby when it comes out of the oven. Enjoy hot!