Easy Prime Rib Roast

Ingredients (10)

• 4-8 lb. beef bone in rib roast
• 2 Tablespoons coarse Kosher salt
• 2 teaspoons garlic powder
• 2 teaspoons black pepper
• 3/4 cups heavy cream
• 1/4 cup mayonnaise
• 1/2 cup sour cream
• 4 Tablespoons prepared horseradish*
• Salt, to taste
• 1/4 cup chopped chives