We all like variety, but none of us want to spend all day cooking! I have about 3 go-to meals that I can always whip up in a hurry, but they're easily customized depending on what I feel like eating. Oatmeal w/ flax seed for breakfast (add toasted, chopped nuts, maple syrup, craisins, whatever!), stir-fry for lunch (any veggies you have, egg, whatever other protein is lying around the house), or fish and veggies.
So I keep oatmeal, flax seed, dried fruits, frozen fish, frozen veggies on-hand at all times, and I can make a few dozen different variations on those 3 dishes... no excuse to not eat healthy!