Ripe banana is one of my go-to ingredients for adding sweetness more healthfully. I add slices of it in peanut butter sandwiches instead of jelly, mash it into pancake or waffle batter, and blend frozen chunks of it into smoothies — no additional sweetener needed. I typically buy a couple of bunches at a time, let them get very ripe with plenty of brown spots, then peel them, break them into chunks and freeze them, so I always have some on hand.