Combine the Base. In a medium bowl, stir together 1 cup of Greek yogurt with ¼–½ cup of buttermilk. Adjust the liquid amount based on how thick or thin you want your dressing.
Season & Blend. Mix in ½ teaspoon garlic powder, ½ teaspoon onion powder, and a pinch each of salt & black pepper. Stir in 1 tablespoon of chopped fresh dill, parsley, or chives (or 1 teaspoon dried) to enhance the herbal flavors. Taste and adjust seasonings. If you prefer a tangier flavor, add 1 teaspoon of lemon juice or a dash of white vinegar.
Chill & Thicken. Cover the bowl and refrigerate for at least 30 minutes. This chilling period helps the flavors meld and thickens the dressing slightly.
Serve & Enjoy. Drizzle over salads, use as a dip for veggies, or even spread on wraps and sandwiches. Store leftovers in a sealed container in the fridge.