I'm not suggesting that you splurge but if you must, here ya go!
Two boxed brownie mixes baked according to the package. Pour 1 bag of mini marshmallows on top. And pour on 1 container of chocolate frosting melted in the microwave for 30 seconds. I cut the oven off then put it back in. It will make them of so very gooey and wonderful. I hope you had a lovely Christmas eve eve!