I got this recipe from my mom – we made playdough sensory jars and my kids LOVED playing with them. Here are my Amazon affiliate links for the items used: fake rainbow sprinkles, resin candy pieces and airtight jars to store them in.
I use vanilla extract in mine to give it a nice smell, but totally optional! Sometimes I use a little almond extract instead of the vanilla and yummmm!

Here is the recipe:

1 cup water
1 Tablespoon oil
2 teaspoons vanilla extract
coloring of your choice
Bring to a boil

In a separate bowl, combine
1/3 cup of salt
1 cup flour
2 Tablespoons cream of tarter – mix well!

mix the powders into your pot of boiling water and oil, and stir over medium heat until globby. Once it’s cool, you can knead the dough.