If I've stuck to my plan for the day, I reward myself with a mini chocolate before bed. Then I brush my teeth so I won't eat another. I keep the chocolates in the freezer, removing one at dinnertime so it can warm up before treat time.
This helps me delay craving gratification. It also keeps me from feeling overly deprived. I don't like frozen chocolate, so keeping it in the freezer prevents cheating. I use milk chocolate because it's my fave, but dark chocolate would be a healthier option.