Carnation instant breakfast?

i have to take these to gain weight. do u know any recipes(particulary milkshakes) that i could make with them. also when i tried to make a milkshake with a package of carnation, milk and a lot of ice cream(i had to keep adding more to try to make it thicker but it wouldnt work) it just turned into milk that was kinda whipped. it didnt have any consistantcy of a milkshake at all. how could i make it thicker and icier.??