I feel for you with going back to work. I also feel for your attempts to make your kids eat. I have been there. What I have to say is similar to the others. I make the effort to prepare things my kids like each day, but those things will be healthy the majority of the time. I keep the junk food to a minimum and in small portions. I make it clear that I am not a short order cook. I serve everyone the same meal at dinnertime. If they don't want to eat - fine. They still have to sit with us for awhile. Then they can leave, but no dessert. They are allowed to come back later and eat their dinner, and later dessert if they eat the amount that I designate, but I do not go to the effort to warm it up. My kids learned that they got a nice warm dinner at dinnertime.
They say you have to taste something on average of 14 times before you aquire a taste for it. Keep putting small (teeny) amounts of new foods or undesireables for them to taste or at least lick. Then give lots of praise when they do it.
One idea to add to having the kids cook is having the kids start a small vegetable garden (or herb garden that fits in the window sill for winter - like those Chia ones). Then they can use those in their cooking. Then they can enjoy watching you eat it! You can pretend that you need encouragement to try it. Kids love role reversal!
When you put foods on their plates, put ridiculously small portions on them. Kids can get really overwhelmed with what we would think would be a good portion and lose their appetites. This could be a win-win because it's alot easier for them to be successful eating and please you and they are getting healthy food.
You could try a small plate of "dips." My son likes to dip raw carrots in ketchup - I know it's disgusting, but he eats it. Some "dips" you could put in quarter size dots on a plate are soy sauce, ketchup, mustard, maple syrup, mayo, ranch dressing, or melted cheese.
Schedule the snacking. Don't let them eat just anytime and anything. That can ruin the appetite and aid in too much weght gain. Doctors say limit the juice to 6 oz. per day and there is a limit for milk too, I forget that one. Fluids can fill a kid up fast. I used to not let my kids drink until they have eaten about half of what I thought they should eat. I still use that rule at restaurants. I order their drinks to be served with their meal only and they have to eat first. At home during dinner they drink just water, which is what their bodies need anyway.
Check with your doctor. It is possible that a physical problem may be to blame as well. Some kids have reflux and mealtimes are horrible for them. Your kids also may be referred to a speech therapist if they are having speech delays as well. Sometimes kids can have extreme sensitivities to textures - not just food but other things that go in the mouth too. The speech therapist would work with decreasing that sensitivity with brushing techniques and mouth exercises.
Good luck to you!
J.