Combine water and cajun seasoning in 6 qt crockpot, stir until cajun seasoning is as dissolved into the water as possible. Add peanuts. Allow to cook overnight or at least 8 hours on high. Taste a peanut and see if it is soft enough.
Serve warm or cold.
Enjoy!
Recipe by Peppers and Peaches at https://www.peppersandpeaches.com/3-ingredient-cajun-boiled-peanuts/