Place apples into a large bowl. Sprinkle the apples with one tablespoon of vanilla. Top with brown sugar, cinnamon, nutmeg and dash of salt. Pour apple mixture into prepared pan(s).
In same bowl, Place all dry topping ingredients. Using fingers or a pastry cutter, cut butter into dry ingredients. Spread/sprinkle topping on top of apple mixture. A food processor may also be used.
Bake for about 45 minutes or until apples are bubbly and topping is golden brown.
Remove and let sit for 15 minutes. Serve warm with vanilla ice cream or whipped cream.