Slice, peel, and core the apples.
Add the apples, water, and cinnamon sticks to a crock pot, and cook on high for 1½ hours.
Preheat oven to 400º F. Line a 1/2 sheet pan with parchment paper and set aside.
Cut the pumpkins in half. Scoop the seeds and pith out. Place the pumpkins flesh-side down in a baking dish, and add ¼ cup of water. Cover tightly with foil, and bake for 30 minutes. Allow the pumpkin to cool.
Once the apples are well cooked, add to a blender, and blend until very smooth.
With a spoon, scoop out the roasted pumpkin, and add to blender with some of the apple. The pumpkin will be very thick, so mixing it with some of the apple mixture is necessary. Add water as needed to keep the blender running.
With a spoon, scoop out the roasted pumpkin, and add to blender with some of the apple. The pumpkin will be very thick, so mixing it with some of the apple mixture is necessary. Add water as needed to keep the blender running.
Turn off heat, and stir in vanilla. Allow to cool prior to storing the pumpkin apple butter in glass jars or storage containers.