I think we've been making peanut brittle this way since we got our first microwave:) Don't know how or where we got the recipe but I've been making it with the grandchildren for over twenty years. You'll never believe how easy and delicious this peanut brittle is to make and eat! I've, also done it with walnuts and they were just as good. This holiday peanut brittle makes excellent gifts! My co-workers starting asking for this after Thanksgiving! Enjoy!