Mix together one box vanilla cake mix—I use the French vanilla—two beaten eggs, one stick softened butter, a tablespoon of vegetable oil, and 1 oz. green food coloring.
In another bowl, mix one cup corn starch with 1 cup powdered sugar. Using a large spoon, scoop up a lump of the green dough, shape it into a ping-pong ball, and roll it around in the starch/sugar mixture until coated.
Place on a lightly oiled cookie sheet and bake at 375 on a middle rack until they crinkle, about 8-10 minutes. Take care they don’t brown. Once done, remove from oven and let sit 2 minutes before placing on wire rack to cool completely.
For hearts, mix a half cup each of flour, corn starch, and powdered sugar mixed with a half stick soft butter, just enough cold water to make a stiff dough, and red food coloring. Cut into heart shapes and bake on an oiled cookie sheet at 350 until crispy. Glue to cookies with a paste of powdered sugar and water.