Creamy Feta Peppercorn Salad Dressing

½ cup Sour Cream

 1 cup mayonnaise
4 tsp. white vinegar
1/2 teaspoon oregano
1/4 teaspoon black pepper
1/8 teaspoon garlic powder
2 oz. crumbled feta cheese
1-2 tablespoons milk

Combine mayonnaise and sour cream.  Add vinegar and stir until smooth.  Stir in oregano, pepper, and garlic powder and feta cheese.  Add milk until desired thickness is achieved.  Chill overnight!