Last time I was at the store, I did my math wrong. I was planning on making ice cream, which called for 2 cups of heavy cream. Somehow I decided a quart was 2 cups rather than 4. So here I am, with two extra cups of cream. Unless I’m doing some heavy duty baking, cream is not something I use very often. I didn’t want it to go bad, so I figured, let’s make some butter!