Preheat oven to 400°F.
Toss apples in a Ziploc bag with flour and mix to coat. Remove apples and toss in a bag with sugar and cinnamon. Arrange slices in the pie dish making sure to include any excess cinnamon and sugar.
In a medium bowl, mix together sugars and flour and cut in butter until crumbly. Spoon the mixture over the apples covering the top.
Bake for 45 minutes. Top with whipped cream or serve warm with ice cream.