Good, safe, healthy way to gain weight?

Have fun with it, I wanted to gain 10 pounds for working out and its the funnest thing ever. Just go nuts on healthy foods man. I'd come home from school, have a couple pieces of whole wheat toast, slice up some cheese, maybe have a good bowl of cereal, have a granola bar and some ham. Then my mom would come home and make dinner of some sort of meat and vegetables + baked beans or something. After that I'd be back in about an hour scavenging for food in the fridge maybe eat an apple or something. this was just after school, it rocks man just go nuts and eat as much healthy things as you can.