Here is an easy-to-follow recipe for homemade butter. Begin with 35% fat whipping cream. Whip it thoroughly, then rinse the butter with cold water and refrigerate it.

Tips:

You can use any amount of cream; I personally used two 0.5-liter packs.
The greater the quantity of cream, the longer the whipping time required.
Opt for a large bowl to prevent splashing while whipping the cream.