Prep the veggies: Wash everything well. Peel the carrots, then cut all vegetables into even sticks or bite-size pieces so they’re easy to grab and dip.
Mix the base: In a medium bowl, whisk together mayonnaise, sour cream (or Greek yogurt), and 1/3 cup buttermilk.
Add flavor: Stir in lemon juice, Dijon (if using), parsley, dill, chives, garlic powder, onion powder, salt, and pepper.
Adjust texture: Add more buttermilk a tablespoon at a time until the dip is as thick or thin as you like.
It should cling to the veggies without feeling heavy.
Taste and tweak: Add a pinch more salt, pepper, or lemon juice if needed. Fresh herbs will brighten as they sit.
Chill: Cover the dip and refrigerate for at least 30 minutes to let the flavors meld.
Serve: Arrange the veggie sticks on a platter with a bowl of ranch in the center. Add a few lemon wedges if you like a tangy finish.