Put some heavy cream in a medium bowl. Some = however much you think you need. More cream for more whipped cream, less for less.
Add a little sugar, and some good quality vanilla. Me, I like this stuff, when I have the money.
Whip it. A hand-mixer works best, in my experience, but mr. delagar uses the stand-alone mixer.
Taste it as it whips. If it's not sweet enough, add more sugar. Not vanilla-y enough, add more vanilla.
When it gets to looking thick and like whipped cream, you are done. Stop! Don't go too long, or you will have butter.
(Yes, I do speak from experience.)