Stand next to me and I will do my level best to give you what I don't need!
Seriously, figure out your BMR (google for the formula) and then add your activity level - get a total number of calories that your body burns daily.
Once you know that, you can add a healthy 500 calories per day or less and you will gradually begin to put on weight. Or if you are like me - just look at a cake and poof the weight goes up!!