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Other than Fireball, What's the best spell for cooking?
(ttrpg.network)
Remember to always check creative uses of spells with your DM.
If it were my game, I'd argue that fabricate creates an object out of raw materials, with the same skill as the caster, (if I recall the text correctly, masterwork items can't be created unless the caster has the skill required to craft one). In my mind, fabricate replaces the tools and time required to create the object, but not the skill. I'd say that you could use fabricate to make a meal, even a large one, but it would not be a banquet unless the caster was also a proficient chef.
Also, I think all the items come out at room or ambient temp, you can't use fabricate to create a superheated iron sphere that sets everything nearby on fire. So the food would be "cold" in my opinion.
Does that mean you can't fabricate an ice sculpture out of ice or a snowman out of snow?
I think the "finished product" probably should be at whatever temperature we associate with that thing as a "finished product". "a pizza", for example, would be warm - assuming the caster had the skills to make a good pizza. Some objects have a temperature as part of their essence of being "that thing" and if you change them to be room temperature, then they're no longer that thing.
As for "the caster needs to be a proficient chef" we're covered. Konsi is a proficient chef. Personally, I wouldn't allow this for a caster without cook's utensils. (they could make sandwiches though)
As always, check with your DM. People are going to interpret this differently.