When I was newly married, twenty years ago, one of the tricks I learned from B's mother was how to make whipped butter. The recipe called for butter, margarine, and vegetable oil. You let it get soft and then whip it in the mixer until it gets white and fluffy. It is then easier to spread on bread. There is also the theory that with all the air whipped in you use less. I am not so sure on that one.
I still like the whipped butter. Last year we eliminated shortening and margarine from our diet so I have adjusted the recipe. I now use one pound of butter and a half cup of olive oil.
I like the way the butter looks in these vintage jelly jars. I found a whole box of these at a garage sale a couple of years ago.