Before you begin preparing any of the other ingredients, cut the butter into 1-inch pieces and measure out your sour cream. Set both in a warm place in your kitchen.
Place bacon pieces in a cold skillet and cook over medium heat until bacon reaches your preferred level of doneness. Use a slotted spoon to transfer the bacon to a paper towel-lined plate and set aside.
While your bacon cooks, to a large pot, add your peeled and chopped potatoes. Cover with cold water so potatoes are completely submerged by about 1-inch. Add salt and bring the water to a boil. Reduce heat to keep the water at a good simmer. Cook until the potatoes are tender—you should be able to easily smash a piece against the side of the pot with a fork, about 10-15 minutes. Drain the potatoes, return them to the pot and cover to keep them warm.
To the cooked potatoes, add the cubed butter. Use a potato masher to mash the potatoes until they reach your preferred texture.
Heat all of the heavy cream in the microwave until it is steaming hot. Stir in sour cream and ¼ cup of the warmed cream. Taste and add remaining cream if needed.
Stir in the cooked bacon, cheddar cheese, and chives, and then salt and pepper to taste.
Keep the potatoes covered until you’re ready to serve them, and enjoy!