Preheat the oven to 220 degrees. Arrange 3/4 of the apple slices in a cast iron skillet in the bottom and drizzle 4 tablespoons of butter over the apples. Sprinkle the brown sugar over the top of everything. Place the skillet in the centre of the oven for 10 minutes.
In a separate bowl, combine the eggs, milk, flour, vanilla, cinnamon, salt and the remaining butter. whisk until the batter is smoothed.
Remove the hot skillet from the oven and pour the batter into the skillet. Place the skillet in the centre of the oven and bake for 18-20 minutes or until the pancake is fully puffed and browned on top. Do not open the oven during the first 15 minutes of cooking or you might deflate your pancake.
Remove the pancake from the oven and serve topped with the remaining apple slices and cream. Enjoy!
