I tracked down the original suggestion to here[0], and I was off by a factor of four. Mea culpa, especially since I've actually used the 2 tbsp version a couple of times.
That's much more reasonable, but it's still around a candy bar's worth of calories. You may want to find a different method, depending on how much you want to cut.
0: http://slatestarcodex.com/2017/04/25/book-review-the-hungry-... # middle of section IV