A while back I got into mug cooking. That's small recipes you can make in a mug, with a microwave. I went through a big phase of this about 18 months ago or so, and then promptly forgot about it again.
Until Friday night. For some reason, I stumbled across a e-cookbook of them I had and was hooked all over again. I like taking the recipes and tweaking them, to make them my own. I'll halve the sugar, to reduce calories, use margarine instead of butter, substitute ingredients to see how they'll turn out. Because these are tiny recipes, that don't take much in the way of ingredients or time, if an experiment is a dreadful failure, it's not the end of the world.
I found a new recipe I had never made before, Peanut Butter Mug Cake. It turned out amazingly well.