01 - Set a medium saucepan over medium-low heat. Add the cream cheese and whole milk, stirring continuously with a whisk or wooden spoon until the mixture is completely smooth and there are no lumps remaining.
02 - Add the shredded cheddar cheese one handful at a time, stirring constantly after each addition. Continue until all the cheese has melted and the dip reaches a silky, uniform consistency.
03 - Stir in the garlic powder, onion powder, smoked paprika, black pepper, cayenne pepper if using, and salt. Keep the pan over gentle heat for 2 to 3 minutes, stirring frequently to prevent scorching on the bottom.
04 - Remove the saucepan from heat. Pour the dip into a warm serving bowl and sprinkle with chopped fresh chives or green onions for a bright, mild onion finish.
05 - Present the dip warm alongside tortilla chips, crusty breadsticks, or crisp cut vegetables such as bell peppers, celery, and carrot sticks.