Try a couple of these a day for a few months and see what happens. Make sure your drinking these in addition to your regular diet, not in place of food. I use enough whey protein (2 or 3 scoops) to get to 50 grams of protein from whey
2 to 3 scoops whey
1 banana
2 cups milk
1 tablespoon peanut butter
2/3 cup raw oats
couple handfuls ice cubes
Blend it, and drink it. It makes a one quart drinkable bulking shake.
Should give you around 1100 cals, 135 grams carbs, 40 grams fat, and 75 grams of protein.
If you drink two of these to your diet per day, in a week you will be adding a whopping 15, 400 calories a week to your diet.
This is how I make mine, and of course you can adjust ingredients until you get it to your liking.