You'd have to make the filling and the mashed potato on the stovetop as per the recipe, but I'm sure it could be baked in the air fryer once it was assembled assuming you had an oven-proof dish that would fit in the air fryer. As for timings etc, I can't help with that because I've never tried it. Keep a careful eye on it while it's cooking though as I'd imagine it would get over brown on the top pretty easily.

I wouldn't advise using milk in this recipe because it will make the sweet potato mash too thin. That's why I recommend coconut cream from a can of full-fat coconut milk. You can use what's leftover in a curry or smoothie maybe or it freezes well if you won't use it immediately. It really helps make the sweet potato nice and rich. If you don't want to but a can of coconut milk then just omit it. Hope that helps!