Do you have access to a grill...like a George Forman grill. There's hardly anything faster than throwing a chicken breast, brushed with a little olive oil and a spice or two (rosemary, basil or just some pepper) or a pork chop with some dill weed (my personal favorite) on the grill or in the broiler. Just don't overcook it. Grab a bagged salad at the grocery, some presliced mushrooms and nice vinagrette dressing...salad in minutes. Throw some frozen green beans in the microwave (the little skinny FRENCH ones!). Dinner in 15 minutes.
Also, there are more and more fast food options too. Bunless burgers or grilled chicken sandwiches. Subway has lots of options and the new $6 Burger at Carls Jr. is VERY filling (that's the name BTW, not the price..it's like four bucks). Just skip the french fries.
If you are having very much of the full-sugar soda and candy, just replacing that can make a difference. And, for me, cutting way down on the carbs (starches) made the sugar cravings go away.
Good luck!