I have a few ideas that I hope will help. First, find a slow cooker cookbook. There are lots of different things you can cook in one, and it can make dinner time a lot easier when you can cook at a less stressful time of the day.
Second, precook some meat, or buy some precooked. I find that it's a lot easier to be willing to cook a quick dinner if I can pull some already cooked ground beef or chicken out of the freezer. It takes 2o minutes out of the cooking process so dinner feels a little easier. My kids love to eat spaghetti, chili macaroni, taco soup - all which take 25 minutes or less if you already have the meat cooked. We also sometimes make chicken quesadillas with just chicken and cheese and sometimes green chilis or olives. It is easy to cater this to what each child likes.
One last suggestion that has helped me, when I actually do it, which is not consistently. If I plan out meals a week in advance and then do the shopping for them, dinner is much easier. Somehow taking the decision making process out of the cooking makes the whole task seem more manageable. If you look through some cookbooks or search online, you can probably find some recipes that don't take much more time than it takes to get in the car and drive for fast food.