For the crust: Preheat oven to 425 degrees. Remove pie crusts from package. Lightly dust a working surface with flour then unroll and stack pie crusts on top of each other.
For the topping: mix 1/3 cup granulated sugar, 1/3 cup brown sugar, quick oats, flour and salt. Add butter and cut butter into mixture using a pastry cutter until crumbly (or rub butter into mixture with your fingertips). Transfer topping to refrigerator.
Place apples in a large mixing bowl then pour lemon juice over apples and toss to evenly coat. Pour sugar mixture over apples and toss to evenly coat.
Bake until apples are soft: Bake in preheated oven 33 - 38 minutes, while tenting with foil during the last 10 minutes or so as needed to prevent excess browning, until apples are tender when pierced with a toothpick. Remove from oven and let cool until warm.
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