Chef John's Fresh Berry Fool
While certainly not light on the calorie counter, this berry fool (from the French 'fouler' meaning 'to mash') is shockingly airy on the palate. It's that contrast between the rich, fluffy cream and the syrupy, tangy fruit that makes this so much greater than the sum of its parts. Fresh berries are a classic, but this would work with peeled, diced, ripe peaches.
You can substitute plain yogurt or sour cream for the crème fraiche but, if you do, wait until the whipping cream is almost completely whipped before adding.