Buttermilk Parmesan Salad Dressing

Buttermilk Parmesan Salad Dressing
2 T minced onion
1 clove garlic
1/3 c. lite mayonnaise (or Greek Yogurt)
½ c. buttermilk
2 T. finely grated Parmesan cheese
Fresh or dried herbs: oregano, Italian, your favorite. Flavors are better if made a day ahead. Things to try: turmeric, ground bay, rosemary, sage.