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Export 8 ingredients for grocery delivery
Step 1
Place the potatoes, broth, garlic and butter into a 6qt slow cooker. Season with salt; mix together and cover with lid. Cook on HIGH setting for 4 hours or LOW setting for 7-8 hours, until very tender.
Step 2
Mash potatoes with a potato masher or electric beater. Stir the sour cream and milk through until well combined and creamy (add more milk if desired). Stir through the parmesan cheese.
Step 3
Keep on low or warm setting until ready to serve.