I have found the greatest 3rd grade teacher to ever help out a preschool teacher. She has lots of free printables and ideas you could use in your classroom, but this will help all those teachers that ask for volunteers to make play dough.
Visit Clutter Free Classroom
for a free printable picture and word recipe card.
It would be great if you make play dough in the classroom too. Children could easily follow the picture cues to make the recipe.