Hm, the thing is that you need to go fetch some stuff one at a time (three for a recipe if I remember correctly?), so that's three trips down, choping (& maybe chasing/getting stunned) some stuff and going back up.
In Overcooked you have to go fetch ingredients one at a time as well, but those are usually close by and you're much faster (movement wise).
So, my advice would be to sped up this process (or make it so, that the recipes are easier or customers more patient ;))
Btw, that's awesome that you want to work on your game post-jam!