In a medium bowl, combine 1 ½ cups sour cream, ½ cup mayonnaise, 4 teaspoons dried minced onion, 2 teaspoons onion powder, 2 teaspoons Dijon mustard, 1 teaspoon garlic powder, 1 teaspoon salt, ½ teaspoon pepper, and 3 of the 4 tablespoons minced chives,.
Whisk the dip ingredients together until smooth and combined.
Cover the dip and refrigerate for 30 minutes before serving. Top with the remaining tablespoon of minced chives and garnish with additional dried minced onion, if desired. Serve with chips, veggies, or crackers!