If I know I am going to be cooking all week, I typically go ahead and chop all my vegetables that need to be chopped ahead of time. It save a lot of work to do!
Also, learn to eye ball stuff instead of measuring.
Grilling is a quick and easy alternative. Just marinate and throw it on!
Instead of preparing separate side dishes, just get a can of green beens to boiling and add some Mrs. Dash for flavor! (onion is good too!)