creamy italian dressing

Ingredients

• 1 cup mayonnaise
• 1/2 cup sour cream
• 1 tablespoon finely minced onion
• 1/2 teaspoon garlic powder
• 1/2 teaspoon oregano, dried
• 1/2 teaspoon basil, dried
• 1/2 teaspoon parsley
• 2 tablespoons grated parmesan cheese
• 2 tablespoons white vinegar
• 1/4 cup olive oil
• 1/4 teaspoon salt
• 1/8 teaspoon pepper
• 1/2 tablespoon sugar