Begin by peeling the russet potatoes, then rinse them under cold water to remove any dirt.
Cut the potatoes into evenly sized chunks (about 1 to 2 inches) to ensure they cook uniformly.
Place the potato chunks in the crockpot and pour the chicken or vegetable broth over them.
Add in the milk, sour cream, unsalted butter, garlic powder, onion powder, salt, and pepper. Stir gently to combine.
Cover the crockpot with the lid and set it to cook on low for 4 hours, or until the potatoes are fork-tender.
Once cooked, use a potato masher or electric mixer to mash the potatoes to your desired consistency. Adjust seasoning with more salt and pepper, if needed.
Garnish with fresh chives or parsley, if desired, before serving. Enjoy!