In-N-Out recently added hot cocoa to their menu:



It costs $1.60+tax and is actually pretty decent as they use Ghiradelli chocolate. I didn't like that the marshmallows were dehydrated but I imagine they had to cut costs somewhere (and this is a relatively minor complaint all things considered). They also don't use milk, but as I don't really like drinking milk I don't consider it an issue either.

Bonus: the hot cocoa is free for kids when it's raining out.