You'll need a hand mixer or stand mixer unless you have some good arm strength (or a lot of friends). Combine 1 cup of cold heavy cream with 2 tbsp powdered (confectioner's) sugar, and 1/2 tsp vanilla. Mix on high with a hand mixer or medium speed with a stand mixer to your desired consistency, anywhere from soft to firm peaks (when the cream stays in a peak when you lift the beater out and turn it over). But be careful not to overmix or you will have butter!