The fabulous part? This is SO EASY. So, so, so, so, so easy. Like, had-five-drinks-and-a-recent-breakup-easy. It has four distinct steps and in print seems slightly intimidating, but it isn’t whatsoever. I promise. I swear. I even had every single ingredient on hand. And not just because I’m a hoarder. Would I lie to you?
Thoroughly grease you baking pan. Melt ingredients together in a saucepan or microwave, then pour into the baking dish and spread until even. Let cool and harden completely.
Melt butter in a saucepan over medium heat. Add in sugar and milk, stirring until dissolved and bring to a boil. Let cook for 5 minutes, stirring occasionally. Add in fluff, peanut butter and vanilla, stirring until smooth. Turn off heat and fold in peanuts, then pour over bottom chocolate layer. Let cool completely.