Preheat oven to 350 degrees.
Remove crusts from freezer and let thaw at room temperature while you core, peel and slice the apples.
In a microwave safe bowl, melt the butter.
Add ½ cup light brown sugar to the butter. Stir.
Spread mixture in the bottom of a 10-inch baking dish.
With your hands, tear one of the lightly thawed pie shells into 2 inch pieces and and place over the mixture.
In another bowl, stir together the remaining 2 cups of brown sugar and pecans.
Add a layer of apples on top of the crust layer, sprinkle on the pecan-sugar mixture.
Place the other pie shell on top, upside down and press down to form a dome over the apples. Prick top with a fork 4 times.
Bake for 45 minutes to an hour. Let rest for at least 30 minutes before serving.