Gather Ingredients: Ensure you have all the ingredients measured out and ready to go.
Combine the Base Ingredients: In a mixing bowl, combine the sour cream and mayonnaise. Use a whisk or fork to blend them until smooth and creamy.
Add Flavorings: To the creamy mixture, add the dry mustard, black pepper, scant salt, garlic powder, and Worcestershire sauce. Whisk until fully incorporated.
Fold in the Blue Cheese: Carefully fold in the crumbled Danish blue cheese, keeping some chunks for texture.
Taste and Adjust: Taste your dressing and adjust seasoning if needed.
Chill and Serve: Transfer to a storage container and let it chill in the refrigerator for at least 30 minutes.