In a bowl mix together the bubble bath, essential oils and add the coloring (if you want uniform color or leave it until later for a marble effect).
Add the corn starch. Start with 1 cup and mix it in, if it doesn’t pull together add another 1/2 cup of corn starch and continue mixing. As you mix it will pull together into a nice, solid ball. Start kneading with your hands to really mix it all in.
If you wanted the marble effect, add the coloring now to your bubble bath play dough, or leave it creamy white for a beautiful, natural finish.
Store in an air tight container and use within a week.