Preheat oven to 350 degrees, place an 8 or 9 inch cast iron skillet in the oven to preheat. You can also use an 8 or 9 inch baking dish.
Whisk the flour,both sugars,salt,cinnamon and nutmeg together in a large bowl.
In a medium bowl whisk the eggs, vanilla and melted butter together.
Place the chopped apples and pecans in the flour mixture, toss to coat.
Stir the egg mixture into the flour mixture until just combined. Mixture will be thick, stir until there's no visible sign of flour that hasn't been mixed in.
Melt one Tablespoon butter in the hot skillet, swirl to coat the pan, you can also use a pastry brush to coat the bottom and sides of the pan with the melted butter.
Place the pan back into the oven, bake 35- 40 minutes until the sides are dry and a toothpick inserted in the center comes out clean. Cool about 20 minutes, cut and serve warm.