Would it be possible for any of the kids to start dinner for you? Perhaps you could all do prep work the night before, say while you are all cleaning up after dinner, and then you would just have to throw everything together when you get home. Another idea is to do most of your cooking on the weekend. My cousin preps all of her meals on Sunday. Some things she just gets ready and puts in containers in the fridge so she can pull everything out and cook it the day she serves it. Other meals, she cooks everything and then just reheats it on the day she eats it.
I second the Pinterest idea. You can find a ton of freezer meal ideas and also crockpot meals. There are many ideas where you prep everything, dump it in a ziploc bag and freeze it. Then you just take it out of the freezer and put it in the crockpot the day you want it.
Denise