Add cottage cheese and Greek yogurt to a blender or food processor. Blend on high until completely smooth, about 1-2 minutes, scraping down the sides as needed.
Add lemon juice, garlic powder, onion powder, dill, parsley, chives, pepper, and salt. Blend again until well combined, about 30 seconds.
Taste and adjust seasonings. If you prefer a thinner dip, blend in milk 1 tablespoon at a time until desired consistency.
Transfer to a serving bowl, cover, and refrigerate for at least 30 minutes to let the flavors meld.
Serve with fresh vegetables, crackers, or chips. Store leftovers in an airtight container in the fridge for up to 4 days.