I have made this recipe at least 7-8 times in the past 3 years. Every time I tweak something and now I think its absolutely perfect. The tick, at least in my opinion, is to food process the apples and cranberries together into small pieces and stir those pieces into the sweet potato mixture using my kitchenaid. I also double the crumb topping and make it in my kitchenaid that way everything is completely mixed up and its not grainy just crunchy and delicious. Oh and I add a but of pumpkin pie spice too!