High calorie liquid options?

What else can be used to supplement calorie intake besides drinks like Ensure and Boost? Right now I'm using baked treats to supplement my calorie intake.

I am about to start a new part-time job and I don't want to look like a greedy person by munching on pastries or baked treats at work. That just wouldn't make a good impression on my colleagues.

There is also lack of availability of Ensure-type drinks where I live. There is a GNC that sells the mass-gaining drinks...but yuck!

Can I drink little packs of chocolate milk instead? I don't like fruit juice or plain whole milk. I know the calorie-dense snack options like nuts and PB sandwiches that I can take to work, but I'm looking for suggestions for drinks.

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