These cute little wreaths are glorified Rice Krispy Treats, made with cornflakes instead of rice, green food coloring and red hots. The trick is to get the red hots to adhere. Which is tricky indeed.
I got the recipe from "Rose's Christmas Cookies", which I bought "used" off of Amazon for a pittance before other people were thinking about Christmas cookies, at which point the demand and price went up. As I've mentioned on here before, I've had excellent results ordering "used" books off of Amazon. Typically they aren't "used" at all; they are overstocks. But you have to read the condition description.
I am a big fan of Rose Levy Beranbaum, and you should consider reading her blog, because she is extremely generous with her time, answering readers' questions.