First, I took some white cardstock and I printed our Valentine message on it. Here is a link to the PDF that I made. Then, I cut the cardstock in half and had the kids glue heart shaped foil paper doilies to the front. They wrote their names on the back.
Finally, we cut our brownies into large hearts (they look small because I forgot to pick up little paper plates so we had to use large paper plates), and placed them on plates covered with plastic wrap.