My husband and I both work full time and then some. I prefer that our very active daughter eat a proper meal, so when I am at work and she is with dad, I often make a meal, place it in a divider plate, cover it and ask that he be sure she eats that meal.
If it is up to my husband, they will eat filet a fish at McDonalds. I don't mind that they do that sometimes, but not all the time.
You can start a crock pot of chicken, roast, or beans and ask that they eat that. If your children don't mind raw vegetables, that is a good substitute to the frozen, however, I do prefer the frozen vegetables over canned.
Now that it is summer, a pasta salad with some added green beans, garbanzo beans, kidney beans, broccoli, carrots, cauliflower, zucchini, uncooked cucumbers, and uncooked tomatoes will be nice, if the children will enjoy that. My family loves that salad in the summer and it is easy enough to make a big bowl to pick at over a couple of days. I start it with that Classic Suddenly Salad mix. I know it is not the best pasta, but that is what they like. In a separate pot/pan, I toss in the vegetables I have on hand. Add equal parts, Red Wine Vinegar, water, and Olive Oil. I add a little parsley, plenty of oregano, and a pinch of basil, with salt & pepper. I cook it for about 3 minutes on pretty high heat, so that the fluids come to a boil. At that point, the veggies are still pretty hard, but I can push a fork through them. I remove the pan from the heat and mix the drained veggies with the pasta. I let the steam clear and place it in the refrigerator. The veggies should be a little on the crisp crunchy side, yet cooked. Once the salad has sat over night, the pasta will absorb the zest of the dressing, so I just add a little bottled Newman's or Wishbone Italian dressing.
Also, can you ask her to pick up a cooked chicken from the supermarket if she isn't able to cook while tending to the children?