I have the same problem - which means I do a lot of crock pot cooking. You can roast a whole chicken (the easiest thing ever). Just put the chicken in the crockpot in the morning on low, and cover it with mild seasonings because the chicken will not brown - but it will be very most and tender. To make the chicken healthier, toss the skin after its cooked because that is where most of the fat is.
Then add some frozen veggies (frozen broccoli has more vitamins than fresh broccoli) to your dinner, and some whole grain pasta or wild rice. The whole grain stuff is good for you, but takes longer to prepare. If you make a lot of it one night, you can store it for the future. Or you can invest in a rice cooker (they also cook pasta).
I also make a large batch ratatuouillie on the weekends. We have it for dinner on Sunday and Monday night. We try not to have meat at every meal. During the time I'm cutting veggies for the ratatuouille, I also cut up fresh fruits and vegetables for eating during the week. Watermelon is great at the end of the meal. Fresh carrots, celery and bell peppers are filling and easy to take with you on the go.