Start by peeling and chopping 5 pounds of russet potatoes into 1-inch pieces.
Place these chunks into the bottom of a 6-quart slow cooker.
Scatter 1/2 cup (1 stick) of salted butter, cut into small cubes, over the potatoes.
Pour a 32-ounce carton of chicken broth over the top, ensuring the potatoes are well covered.
Cover the slow cooker and cook on high for 4 to 5 hours, or until the potatoes are fork-tender.
Once cooked, carefully drain any excess broth from the potatoes and return them to the crock pot.
Using a potato masher, mash the potatoes until smooth, or leave some lumps if that’s your preference.
Season with salt and pepper to taste.
Add the remaining 1/2 cup (1 stick) of salted butter, cut into cubes, along with an 8-ounce package of softened cream cheese, also cut into cubes, and 1/4 cup of milk.
Mash everything together until well combined, adding more milk as needed to reach your desired consistency.
Once the potatoes are ready, cover them and set the slow cooker to the warm setting until you're ready to serve.