I’m guessing it is supposed to read 1/2 cup chopped toasted walnuts instead of 1/2 teaspoon?

Hi there! So sorry about that—confirming that it is indeed 1/2 cup—we've edited the recipe and appreciate you reaching out about it!

From the photo, it sure looks to me like more than half a teaspoon is used - but it also doesn't look like a half a cup. But then, we don't know how much of the batch that was cooked up actually appears in the photo. I'd use at least 1/4 cup - or more, because we love walnuts, so the more, the better! ;o)