All the flavors of America's favorite pie reworked into portable and delicious Apple Pie Bars.
Ingredients
For the Crust
3 sticks unsalted butter, softened
3/4 cup sugar
3 cups all-purpose flour
1/2 teaspoon kosher salt
For the Filling
6 tablespoons unsalted butter
1/2 cup light brown sugar
12 Granny Smith apples (about 6 pounds)jpeeled, cored and thinly sliced
1 tablespoon cinnamon
1/4 teaspoon freshly grated nutmeg
1/2 cup water, if necessary
For the Topping
3 cups quick-cooking oats
2 cups all-purpose flour
1 1/2 cups light brown sugar
1 1/4 teaspoons cinnamon
1/2 teaspoon baking soda
1/2 teaspoon kosher salt
3 sticks (12 ounces) unsalted butter, cut into 1/2-inch cubes and chilled
3/4 cup chopped pecans

Source Link: http://www.mybakingaddiction.com/apple-pie-bars-recipe/