Add the cottage cheese, milk or buttermilk, ranch seasoning, garlic powder, onion powder, salt, pepper, lemon juice, and white wine vinegar to a high-speed blender.
Blend until completely smooth, thick, and glossy, scraping down the sides once if needed.
If the ranch is thicker than you’d like, thin with additional milk or buttermilk, 1 tablespoon at a time, until it reaches your desired consistency.
Transfer to a jar or bowl and stir in the fresh dill and chives. Taste and adjust salt if needed.