Add the potatoes to a large pot and fill with water until the potatoes are just covered. Season with about 1 teaspoon kosher salt
Bring the potatoes to a boil over medium-high heat, the turn to low and simmer for 20 minutes until the potatoes are fork tender.
Drain and transfer to a large bowl.
Add the pimento cheese, salt and pepper to the potatoes and mash with a potato masher until combined.
Serve immediately.
Notes
Potatoes can be made up to 24 hours in advance and refrigerated in an airtight container. Reheat in the microwave at medium power for 3-4 minutes, stirring after each minute.