Begin by making the cinnamon pecan streusel: Preheat the oven to 350 degrees. Mix together the oats, the flour, the brown sugar, the pecans, the melted butter and a the cinnamon. Spread the mixture on to a large baking sheet and bake for 15 minutes. Using a fork, break up any large chunks.
Next, make the Apple Compote: Melt 4 the butter, the corn syrup and brown sugar in a three quart saucepan. Add the apples and a half teaspoon of cinnamon and simmer for ten minutes.
Preheat the oven to 425 degrees.
Next, make the Caramel Sauce: In a three quart saucepan, mix together the corn syrup, packed brown sugar, and butter. Stirring constantly on low heat, bring the mixture to a boil. Cook for three minutes. Add the cream and salt and bring back to a boil.
In a large mixing bowl, beat together the eggs, vanilla, milk, brown sugar, the kosher salt, and the flour. Stir in two tablespoons of the melted butter.
When the oven reaches 425 degrees, brush the cast iron pan with the rest of the butter and put it in the oven for a couple of minutes. Take the pan out of the oven, and fill it up with the batter. Bake for 25 minutes.
Top the Dutch Baby with the apple compote, the caramel sauce and the streusel.