› recipes › keto-mason-jar-ice-creamSuper Easy Keto Mason Jar Ice Cream - Recipe - Diet Doctor May 10, 2020 · Thanks for your comment! There are actually 0.5 carbs per tablespoon of heavy cream, which would put the 1/2 cup of cream per serving at 4 carbs. Be aware that you can't always trust labels, as food manufacturers are allowed to "round down" if the carbs per serving are less than 1. When using larger quantities, the carbs can certainly add up!