Cracked Pepper Salad Dressing

I don't really care for store bought ranch dressing, I found this recipe and really like it and even more amazing is my husband likes it too!
2 cups mayo
1/4 cup water
1/4 cup milk
1/4 cup buttermilk
2 Tbs. grated parmesan cheese
1 Tbs. coarsely ground pepper
2 tsp. finely chopped green onion
1 tsp. lemon juice
1/2 tsp. garlic salt
1/2 tsp. garlic powder

In small bowl, whisk all ingredients until blended. Cover and chill for at least 1 hour. May be stored in refridgerator for up to 2 weeks. Makes 2 1/2 cups.