Depends on how much wiggle room you have for the day. I buy a 80-90% good quality chocolate bar, where each square is about 50-60 calories. Just break off one, let it melt in your mouth. More satisfying that wolfing down a 240 calorie Snickers (usually).

if you like chocolate, try eating really dark cocolate (like 90% or more pure cocoa). Make sure that sugar is the last ingredien or one of them... darker chocolate is healthier for you and generally lower in calories (most "milk chocolat" bars are so full of calories because of the dairy and the extra sugar). You can also shave the chocolate and top plain yogurt with it. I am not sure if this would work about your, but what about chocolate flavored hard candies, like Reisen's? Also, I like to eat air popped pop corn when want to 'eat for fun" (ie: am watching TV and want to snack).:)