Preheat the oven to 325°F and lightly spray a 13x9-inch metal baking pan with nonstick cooking spray. Add melted butter, sugar, brown sugar, cinnamon, nutmeg, salt, and vanilla to a large bowl and blend well by hand. Add beaten eggs, stir well. Add flour and stir until all lumps are gone. Folding in apples and pecans. Spread the batter evenly into the prepared baking dish.