Start with a large frying pan on medium heat.

Set a timer for 15 minutes right when you start.

Place the 2 cups of heavy cream, the butter, and your sugar substitute in the pan. Stir it occasionally so it doesn’t burn but you don’t have to mix it all the time. I used a whisk.

When the mixture starts to bubble up, I reduced the heat to low and let it simmer until the 15-minute timer is up.