It depends on what you like to eat. I find that it's better to work around what you like to eat and build upon it. Make it a reward at the end after eating all the healthy things you surround it with.
Hard boiled eggs with a little salt. Add eggs to boiling water, wait 30 seconds, then add ice to water. When water returns to boil, reduce heat to sub simmer for 11 minutes. Make a lot at once and have them sitting in your redridgerator.