My husband has a scoop of VegaOne protein powder, mixed with 1/2 cup of oats, a varierty of dark berries, a banana, a big scoop of peanut butter and blended with water every morning. As everyone else says, make sure you get chubby.
The above shake has around 600 calories, and his day of eating every three hours starts from there. He's puffy and very cuddly from all his eating.
I will say, mostly everything we eat is organic, whole grain and full of healthy fats, even his sweet treats.