I am always on a 40/40/20 diet. Normally, I maintain at 3200 calories, so I eat 8 meals of 400 calories. Each meal is designed to be 40/40/20. When I cut, I shrink it down to 5 or 6 meals of the same size. When I bulk, I eat the same 400 calorie meals, but 9 or 10 of them.
I make chicken and rice casseroles, tuna noodle casseroles, oatmeal & protein powder with walnuts, etc.
Lean ham sandwiches are a good standby for me, since they are easy to make. The bread is not great, since it has a higher glycemic index, but its a compromise I make.
Other ideas:
Chicken Breast sandwiches
Oatmeal and some lean meat such as turkey or chicken.