I can't even begin to explain how awesome it is that while cooking, you're seamlessly able to whip another ingredient without even leaving the original recipe. It would be such a pain in the butt to grind the allspice into salt, grind the wheat into flour, make a bun, then go back to the recipe, etc. if all of that had to be done individually. So thanks a whole bunch for that, devs.
But I wish butterfly butter and cheese worked the same way. As far as I've noticed, that's the only stuff that you do need to leave the recipe for. So, bug? If not, I sure think us Glitchizens would be grateful to see that added.