a combination of Sweet Potato and Pumpkin.
I've made this recipe for the last three years and it's SO GOOD that you will never miss the traditional (not as healthy) options.
Since this recipe is one I follow as is, I'm going to link to it for you to access directly. It's SO easy, SO simple and SO GOOD!
I've substituted canned pumpkin puree in past for the sweet potato as well as used half the sweet potato and used the rest pumpkin pie to make a combo. They are ALL wonderful!