I always over estimate and I try to make everything myself- especially the treats! I like to bake oatmeal cookies that are 74 calories each and even have chocolate and peanut butter in them!
If someone else made them, I wouldn't touch them... but since I usually have plenty calories left after dinner I typically have 1 with a half an apple or a few grapes. Hubby usually have like 3-4 cookies, lol
That heath bar cake sounds so good, I feel guilty just thinking about eating a nice hunk of it. I bet it's worth it! hehehe