Okay, every now and then some asks about "healthier" cookies in terms of low fat, low sugar or low calorie, but I'm thinking about exactly the opposite. What's the most decadent, richest, calorie-laden delight there is?

I'm not talking about making a cookie the size of my head to amp the calorie count, and a mixture of butter and sugar doesn't qualify as a cookie, I'm just wondering what Serious Eaters would consider the most decadent cookie they can think of.

Oh, and if your decadent cookie has healthy ingredients like nuts or dark chocolate, that's fine. Oatmeal, probably not, though.