Can my characters cook?

Kairi: She can cook like, really basic food. Pasta, grilling stuff, things like that. Not so much anything more complicated.

Summer: Ohhhh yeah. She prefers baking, but she is just an absolute wiz in the kitchen no matter which way you go.

Those are my two active ones right now, so for additional ones..

Irisviel: She... She tries. She tries so hard.

Nah: Probably basic camping-style food. She can follow a recipe to a T though.

Knight: Watching them try would be adorable but the results would be a gastronomic nightmare.

Nepeta: Does "shoving her kill onto a spit over a campfire for a bit" count?

depends does Nepeta have a good eye for neither over nor undercooking it or does she just get it hot and say 'good enough'

Definitely the second.