You might want to consider just making some basic things in bulk once a month that you can use for a variety of dishes. Things that take a lot of time but that are versatile are good candidates for this. Stock would be a good example of this. You could make a big pot of it and freeze it in small quantities. You can use it for soup (add veggies and maybe some cooked chicken) or the base for sauces or in lots of dishes.
If time is the main issue, you might want to invest in a crock pot. You can do all the prep work the night before, toss it in the pot in the morning and let it slow cook all day while you're at work. When you get home dinner is all ready for you. FlyLady's site has more info and lots of crock pot recipes.