3 cans of tuna, a half cup of olive oil, chicken breast, a potato, some whole milk...
-JK (though if you can stomach blended whole foods, that's way faster than actually sitting down to eat haha... many pro strength athletes have to do this)
@Hyde i'm pretty sure has as well.
Really though:
2 scoops of whatever protein (something like BSN Syntha-6 is AMAZING for flavor and a lot higher cal than most since it has way more carbs/fat - perfect for you); a couple tbsp of peanutbutter or whatever nut butter you like, a couple tbsp of olive or coconut oil (or whatever other oil... you really wont taste it AT ALL), a couple scoops of ice cream, mix it all in whole milk or fruit juice (depending on flavor combos). You can even add cheap carb powders (gatorade powder or the like) as well.
Basically - if its high cal and you can blend it, you can/should drink it. You can easily get THOUSANDS of calories in a single shake like this. Think along the lines of a smoothie or ice cream shake and you'll get the most cals for the least volume