To begin, place your blender jar (or appropriate utensils) in the refrigerator or freezer until thoroughly chilled. The key to getting peaks is that the mixture stays as cold as possible.
1 c. heavy whipping cream
2 T. confectioners sugar
a few drops of vanilla extract, or to taste
Remove your blender jar from the refrigerator and place ingredients inside. Mix on high for 20-30 sec., or until soft peaks form. Use immediately.
Source: trial and error. 🙂