Hello! Yogurt cake!
This recipe by Smitten Kitchen was so easy that I've made the same cake thrice, only with little changes in the choice of citrus and topping sauce. I used whichever fruit that's available in the kitchen: lemon, clementine, grapefruit. As for the sauce, it's blackberries or raspberries.
This is really a treat since it is made with non-fat yogurt, no butter, and moderate use of sugar. The end-result is a fluffy all-day delight. No longer afraid of wasted yogurt.