The streusel recipe is just a standard doorstop-cookbook recipe for oatmeal streusel topping, and it makes about twice as much as you need. It takes about five minutes to make but it does require pulling out the food processor, so it's worth making a double batch. I freeze half, making it simple to make another pan of these or muffins or something else later on, but you could just make half as much streusel to begin with, I suppose. Or you could dump the whole thing on there for extra streusel, but we were going for slightly healthier, you know.
(Note that this is pure pumpkin, NOT pumpkin pie filling)