In a medium-size bowl, whisk together sour cream, mayonnaise, lemon juice, garlic powder, and Worcestershire sauce.
Add-in crumbled blue cheese, chives, and pepper.
Stir.
Add-in 1 tablespoon at a time of Half and Half to thin dressing to desired consistency. Taste and adjust seasoning with salt and additional pepper.
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Store in an airtight container or jar in the refrigerator for up to one week.