this is pretty close.

ZATARAIN'S CREOLE MUSTARD DIP

"Serve this flavorful dip with cut-up vegetables or your favorite chips."

2 cups sour cream
1/4 cup chopped onions
2 tablespoons chopped green onions
1/4 cup Zatarain'sŪ Creole Mustard
1 teaspoon Zatarain'sŪ Creole Seasoning

Mix all ingredients until well blended. Cover.

Refrigerate 2 hours or until ready to serve. Stir before serving.

Makes 2 cups or 16 (2-tablespoon) servings
Source: Zatarain's