Like I said, pee has lots of nitrogen, phosphorus and potassium. It also might be loaded in salt, depending on how salty your diet is. And too much of a good thing, like nitrogen and salt can turn south pretty quickly so dilution is key. And if you take any pharmaceuticals, I wouldn’t even consider making your own pee fertilizer. Just a bad idea.
That was a short tip, so I'm giving a second tip absolutely free of charge.
Fanny Farmer's Classic Baked Mac & Cheese is the way to go.