In a bowl, add 4 tablespoons mayonnaise, 1 teaspoon American mustard, 1/2 teaspoon garlic powder and 1/2 teaspoon dried parsley. Mix well. Slowly add 5-6 tablespoons whole milk and mix thoroughly until the sauce reaches the desired consistency.
Cover and set aside in the fridge for 1 hour.
Serve garlic & herb dip with pizza, fried chicken, kebabs etc.