If using your oven always turns out badly, stick to what you know. You'll have to find something that goes beyond a mug cake (or you can...bring 20 mugs to the party?), but the difficulty factor will remain the same. Take this recipe for chocolate fudge, for example: You just need to mix a few ingredients together and pop it in the microwave.
It's not just for soups, you know. There is such thing as dump desserts, where you can throw some ingredients in the pot and walk away. Hell, you can even bring the slow cooker itself to the party to avoid having to wash another dish later. This recipe, for example, is called Heaven in a Crock Pot -- sold.
Chipwiches, at your lazy service!
JELL-O calls it Instant Pudding for a reason. You can serve a bowl of pudding on its own for peak laziness, or you can try out one of the many, many ways to incorporate instant pudding into an easy dessert. A trifle, for example, doesn't require too much finesse.