Grease sides of slow cooker insert lightly with butter, then add chopped potatoes. Top with onion powder and garlic powder, then pour in chicken broth.
Cube 1 of the sticks of butter and place cubes around the tops of the potatoes. Cover and cook on HIGH for 3 ½ - 4 hours.
Drain potatoes then place back in the crockpot. Add remaining stick of butter (cubed), cream cheese, heavy cream and salt and pepper. Start with ½ tsp of kosher salt and ¼ tsp pepper and adjust from there.
Use a potato masher to mash potatoes until mashed to your desired consistency, using a bit more heavy cream if needed.
Serve right away, or cover and set to WARM setting for a few hours.
