Technically, this isn't really a recipe at all, but as the end of the world is imminent let's not be picky.
This is one I used to make all the time as a student once I'd accidentally discovered it by dropping a packet of sweets in my coffee. It works best with the cheapest ingredients (always welcome) and is so simple anyone can make it. All you need to go with it is a big chair and a very good book. If there's still time.
Mug of coffee, preferably white, preferably instant under these circumstances.
One bag of Minstrels
1. Place a Minstrel on your teaspoon, and rest it in the bottom of your coffee.
2. Wait until the Minstrel begins to turn white and crack around the rim. This will only take a minute or so (fortunately).
3. Eat quickly, making sure to stick your tongue right through the crispy shell. The inside of the Minstrel will have melted, but the outside will be just brittle enough to have a slight crunch and a faint taste of coffee. And possibly asteroid dust.