Need some High calorie Shake's recipe to gain weight

Double cream - roughly 400kcal per 100ml
Greek yoghurt - roughly 150kcal per 1/3rd of tub
Bananas
Add some ice cream...

Those are some of my smoothie staples. I have a young child so mornings are a rush, I throw some stuff in the blender and have a breakfast that I can take to work with me in a shaker and that hits around 600kcal (750 sometimes!)

You could also use full fat milk and add some oats. If I add oats it always makes it quite thick though so I add some water as well