I've whisked up 2 eggs with a dollop of Lake District quark (about the size of 1 egg), a rounded tablespoon of granulated sweetener and a few drops of real vanilla essence. I put 3 ripe blackberries into each of 6 silicone cupcake cases and divided the mixture between them. They're baking at 180C, and I'll get them out when puffed up and golden. Will post the results!