Here is my new trick i learned like few days ago: blend oats till powder, put it in ur shake bottle add few grams sugar, add water or milk (easier wAter), mix then drink.
I just drank 90g oats with liquid eggwhites and i was already SUPER FULL before drinking it but since it's liquid, np. That's 400 cals in 30 seconds. Do it 4 times a day that's 1600 cals. It's REALLY EASY and cheap!!!!