Preheat oven to 425 degrees F.
Lightly beat 2 eggs and then whisk in 1/2 milk.
Pour over 1/2 cup of flour and whisk to combine.
Add a dash of salt and set aside (you can set this aside for up to an hour.)
Core and thinly slice one apple. Toss in 1/4 teaspoon cinnamon.
Heat a cast iron frying pan and melt the butter (or melt butter separately and pour into a glass pie plate or other oven proof dish.)
Quickly pour the batter into the hot pan with melted butter. Arrange the apple slices. Pop excess apple slices into your mouth.
Carefully transfer to the hot oven and bake for 15 to 20 minutes.
Slice and serve with a tiny bit of syrup (preferably maple). Enjoy!