baked ziti is really easy ( i feel silly since i just wrote about it in the post below) but you could prepare that all ahead and all he has to do is put it in the oven to bake.
Crockpot meals are great! I have a shredded chicken taco recipe that is super easy. you can eat over rice or serve just like tacos. you can set it before you leave for work or cook ahead of time and then reheat.
Shredded chicken tacos
1 pkg chicken breasts boneless
1 pkg taco seasoning
1 can corn undrained
1 can diced tomatoes undrained
1 can black beans undrained
Mix all ingredients including the juices in the crockpot. Cook on low 8-9 hours or high 4-6 hours