Lightly spray the insert of your slow cooker with nonstick cooking spray.
Combine ingredients in your slow cooker, reserving 1/2 cup of shredded cheddar cheese, stirring to coat the potatoes completely.
Cover and cook on LOW for 4 hours.
Stir, then sprinkle on remaining cheddar cheese. Cover and cook for an additional 15 minutes, or until cheese is melted.
Garnish with fresh minced chives and serve immediately.
Notes
If keeping warm for additional time, lay some paper towels across the top of the slow cooker and replace the lid to keep it secure. This will catch any condensation.