Can you do some cooking or prep ahead of time for your busy days? Store things in advance in the fridge or freezer, and just nuke em when you're ready to eat?

What about cutting/washing a bowl of fruit the night before, and putting it in the fridge to wait for breakfast? Cooking up a pot of rice pudding with nuts and brown rice works well for us too, you can eat it cold or nuke it in the morning. Keep some yogurt cups in the fridge: instant food that might do more for you than pop-tarts. My son loves the "drinkable yogurt" in bottles for his school lunches, and sometimes I snag one of his bottles to drink as I drive to work.

For dinner you can prep a ziplock bag of veggies. (I love ziplock bags.) Put the veggies in a bowl with a little water and a plate to cover, nuke for 2 minutes or so. Now you have steamed veggies for dinner! Add a couple nuked (frozen) low fat chicken sausages and some nuked (previously cooked) rice or potato.

I find we eat a lot better if I prep stuff ahead of time. On the nights when I work very late the microwave is my friend. I use ziplock bags and Tupperware to organize my meals; servings of dinner or breakfast in the fridge or freezer all ready to go.