Make sure and read all instructions thoroughly before starting.
Prepare potatoes. I like to wash, cut off the ends, and cut out any big eyes. If you prefer, you can also just peel the potatoes.
Quarter potatoes and place in a pan with enough water to cover them. Add in 2 teaspoons salt.
Turn heat on high and bring to a boil. Reduce the heat and continue to cook until the potatoes are tender. You don't want to overcook them, but get them to tender. I check by pricking with a fork.
Reserve ½ cup of the potato water, then drain the rest. Add the potatoes, butter (minus 1 tablespoon for topping), 1 cup of milk, 1 tablespoon cajun seasoning, and black pepper to a bowl.
With a hand mixer or stand mixer, mix on high until the potatoes are mashed, creamy, and whipped. Taste and adjust seasonings as needed. Our family likes it kind of salty and spicy, so I added another teaspoon of salt and another tablespoon of cajun seasoning.
Whip again and test again. Once the potatoes are done, plate, then top with the remaining pat of butter. Last, sprinkle with a little more cajun seasoning.
That is it, you are done!! Now, sit back and enjoy. You deserve it.