In large skillet set over medium heat, melt butter. Add onions, salt and pepper. Cook until caramelized, about 45 minutes, stirring occasionally as needed. If onions begin to burn, turn down heat.
Stir in brown sugar and cook for 1 minute more. Remove from heat and let cool to room temperature.
In food processor, pulse onions, cream cheese and sour cream until smooth. Taste and add salt and pepper to taste.
Put dip into bowl and serve right away or chill in the fridge until ready to serve. Dip will keep in the fridge for about a week.
Top with chives before serving, if desired for an appealing pop of color. Serve with potato chips, crackers, bread, veggies or as you like!
Calories: 160kcal, Carbohydrates: 7g, Protein: 2g, Fat: 14g, Saturated Fat: 8g, Polyunsaturated Fat: 1g, Monounsaturated Fat: 4g, Trans Fat: 0.2g, Cholesterol: 41mg, Sodium: 294mg, Potassium: 118mg, Fiber: 1g, Sugar: 5g, Vitamin A: 492IU, Vitamin C: 3mg, Calcium: 51mg, Iron: 0.2mg