Prepare the Garlic: Mince or grate 2-3 garlic cloves, depending on how garlicky you like your dressing.
Mix the Base: In a medium bowl, combine 1 cup of mayonnaise and ½ cup of buttermilk. Whisk until smooth and creamy.
Add the Garlic and Herbs: Stir in the minced garlic, 1 teaspoon each of dried parsley, dill, and chives, and the lemon juice (or vinegar).
Season the Dressing: Add ½ teaspoon salt and ¼ teaspoon black pepper. Taste and adjust the seasoning if necessary.
Adjust the Consistency: If the dressing is too thick, add more buttermilk to reach the desired consistency.
Chill: Refrigerate the dressing for at least 30 minutes to allow the flavors to meld together.
Serve: Once chilled, serve the garlic ranch dressing with your favorite salads, veggies, or as a dip for appetizers.