Mix dry ingredients together. Then add water starting with 1/4 cup, then add more gradually. You likely will need a little extra water, but be careful not to make they dough too sticky.
Roll dough into 1-2 mm thickness. If you make it too thin it will be more fragile. Cut the hearts out, or whichever shape you choose, rework and roll out dough to use up however much you need until you finish.
Bake at 215°F for 3-4 hours. I let mine cool in the over, but you can remove and allow to cool on the counter as well.
Finish off however you like, decorate with marker or paint and seal will some Mod Podge.
Adapted from: Red Ted Art