01 - Place the sliced cucumbers and onions in a large mixing bowl.
02 - In a separate bowl, whisk together the sour cream, mayonnaise, white wine vinegar, dill, sugar, garlic powder, salt, and pepper until smooth.
03 - Pour the dressing over the cucumbers and onions. Toss gently until everything is evenly coated.
04 - Refrigerate for at least 20 minutes before serving for best flavor. Serve chilled. Stir before serving and garnish with extra dill if desired.