Make the dip: Combine Greek yogurt, ranch seasoning, dill, chives, lemon juice, garlic powder, and onion powder. Stir until smooth.
Adjust consistency: If too thick, add 1-2 teaspoons water or milk.
Taste and adjust: Add salt and pepper to taste. Some ranch seasonings are saltier than others.
Chill: Cover and refrigerate for at least 30 minutes to let flavors meld.
Prepare vegetables: Wash and cut all vegetables into dippable sizes.
Serve: Transfer dip to a bowl and arrange vegetables around it.