Preheat oven to 375ºf. In a bowl combine the apples, butternut squash cranberries, sugar, and cinnamon. Sift the cornstarch over the squash and apple mixture, toss very well. Divide the fruit into four individual baking dishes or in one 6 x 8 casserole dish.
To make the topping, sift the flour into a bowl and stir in the brown sugar, oatmeal and butter. Using a pastry cutter, cut the butter pieces until crumbly. Toss thoroughly. Spoon and level (don’t pack) the topping mixture over the fruit. Place the baking dishes on a cookie sheet and bake in the oven for about 30 minutes or until the fruit is tender and the crisp topping is deep golden. Let cool 10 minutes and serve warm with ice cream. Enjoy!