Wash the redskin potatoes thoroughly to remove any dirt from the skin. You can leave the skin on for added texture and flavor. I usually peel half of my potatoes and leave skin on the other half.
You can leave the potatoes whole or cut the potatoes into even-sized chunks to speed up the process. Place them in a large pot and cover with water.
Bring the pot to a boil over medium-high heat and cook until the potatoes are fork-tender, about 20-25 minutes.
Drain the cooked potatoes and return them to the pot. Add in butter, milk, salt, and pepper. Use a potato masher or hand mixer to mash the potatoes until they reach your desired consistency. For creamier mashed potatoes, add more milk as needed.
Notes
How to Store Homemade Mashed PotatoesI like to store any leftover mashed potatoes in the same pot they were cooked in if they are going to be reheated on the stove. It makes the process much easier. They should be placed in the refrigerator. See below how to reheat mashed potatoes on the stove.If you are going to reheat mashed potatoes in the microwave I suggest putting them in an airtight container and refrigerating after.How to Reheat Homemade Mashed PotatoesPlace the pot of leftover mashed potatoes on the stove over low heat. Add about 1/4 cup of milk (the amount of milk needed will depend on how much mashed potatoes you have. You may need more or less milk.) Keep the heat on low to medium heat to prevent burning and to ensure they warm evenly. Stir occasionally to prevent burning or sticking.