Although I love to use mashed overripe bananas in this recipe, not everyone can tolerate bananas. Another great option is canned pumpkin or roasted sweet potato. They'll have a similar texture and subtle sweetness. You may need to add slightly more moisture, like a little unsweetened coconut milk, to ensure they aren't too thick. Another great alternative for bananas is applesauce, but you may want to use slightly less liquid.