Nutmeg does interesting things to savoury foods. It's subtle though. It's often like a background singer making the other flavors better more than being a diva in its own right. I haven't added nutmeg to potatoes yet, but now I think I might try it. I usually add some fresh ground nutmeg to my spinach and bacon quiche. Nutmeg would also be right at home in a sweet potato pie. So why not mashed potatoes?
I've never used cinnamon on my potatoes, but I add it to some savory dishes like chill. The key is, cinnamon cuts through, so you need veeeeeeeery little.
Maaaaaaaaaan, I was high af making some rice. Wanted to add some butter, sugar, and cinnamon. I got the first two, but unfortunately got cumin instead of cinnamon. Even high I couldn't finish it.
Half of cooking is combining random ingredients you think will work. Took the idea of rice pudding and wanted some cinnamon with it. Think between cinnamon toast and rice pudding.
Wife and I make our own taco seasoning, keep it in an empty jar just like the cayenne (same brand as the picture).
During a taco night grabbed the wrong jar, dumped pure cayenne in .... wasn't so bad until it became aerosolized and maced the apartment
My grandmother (who really was a good cook) once accidentally put salt in a dessert she made instead of sugar. I can't remember what the dessert was, she made lots of them, but I remember biting into it.
Accidentally grabbed the cayenne instead of paprika once for a recipe I was following. Ended up being an improvement, though have gone to mixing them each 50% since then for the best results.
I really like paprika, but it's easy for other flavors to overpower it. A lot of recipes that call for it don't really need it in my experience, because I can't taste it at the end.