It's so easy I've abbrev. the recipe (ie - cut and pasted it from Facebook).
1. Cook pasta in m/wave for 5 mins. I cooked 1/2 cup elbow macaroni.
2. While pasta cooks, reach into fridge, blindfolded if you like, and grab three items. I chose butter, duck rillettes (potted duck) and dijonnaise. Cut a teeny bit of butter off, about 1/2 cm cubed, and spoon one heap each of dijonnaise and duck rillette (no fat) onto a tiny plate made in a small country town given to you by your parents. Mix around with spoon or knife.
3. Drain pasta and stir in the 'sauce' - the hot bowl will cook it.
It tasted creamy and mustardy. Accidentally gourmet. Yum!
I didn't take a photo of the end product, as I didn't predict its success, but it looked a bit like mac and cheese, but with mustard seeds through it. This is a pilfered picture of mac and cheese.
Try it with other mystery ingredients. May not work well with anchovies, chocolate sauce and chutney though ;)
Ladies of the 4 Ingredients fame, look out.