Find Buff spells. Make them choose which one's they'd want to re-skin as food. And make them use 'food-slots' instead of spell slots.

Alternatively, if you want to make them 'item-items' like potions and whatnot, you'll need to do a hell of a lot of resource management with the ingredients so that they can't just produce unlimited 'health brownies' or whatever from scratch.

If you want a 'balanced' version, you'll need to 1:1 reskin spells, and/or make the cost of producing each buff 1:1 for creating a potion from scratch.

At least early on in the campaign they'll have to do resource management. At higher levels it kind of becomes moot because the D&D economy is so wonky at higher levels.

But then again... at higher levels, it won't matter if they can afford to make 10 health potions. The enemies will be able to deal a hell of a lot of damage anyways.