Is the problem really from inhaling powered sugar? (I've never heard of that as a problem with blood sugar, but I suppose it's possible). Or is it a lack of willpower to not sample morsel of goodness that comes in front of you (which would be my weakness)?. Not trying to be accusatory, just wondering what the problem is.
If it's truly the first, you should be able to adjust your pump to accommodate - maybe with a higher (15%?) temporary basal while at work. There is no real reason you shouldn't be able to continue in your career.
However, if you feel the need to change, I wouldn't abandon culinary arts altogether, nor would I even abandon baked goods. You can do as Elizabeth suggests and look into breads or something similar.
But don't give up a career you love for something that merely pays the bills. That's where I am now, professionally, and if you don't like your job - something you do for 8+ hours a day, you won't like life much. And that's really no way to live.