To make the filling:

Cup of Yum
1. Preheat oven to 375 degrees. Grease a 9x9 baking dish.
2. Add the sugar, eggs, and pumpkin pie spice to a large mixing bowl and whisk well until combined.
3. Whisk in the pumpkin to combine.
4. Whisk in the evaporated milk until fully combined and no lumps are in the mixture.
5. Pour into the prepared baking dish and set aside.

To make the topping:

1. Add the flour, oats, brown sugar, cinnamon, and baking soda to a mixing bowl and stir to combine.
2. Add the butter to the oat mixture and use a pastry cutter or two butter knives to cut the butter into the oat mixture until you have coarse crumbs resembling damp sand.

To bake:

1. Sprinkle the topping evenly over the the pumpkin pie filling.
2. Bake for 55-65 minutes or until the top is golden and the center is set.
3. Cool for one hour on the counter before transferring to the refrigerator to chill completely.
4. Serve cold with whipped cream on top, if desired.