Preheat oven to 350°. Combine hot water and Cranberry Walnut Dip Mix in a small bowl. Set aside for 10 minutes.
Meanwhile, combine sour cream, cheeses, and onion in a greased baking dish. Add Cranberry Walnut Dip Mix and stir again to combine.
Bake for 30-40 minutes or until cheeses have melted and are lightly brown. Serve with wheat crackers, bread slices, or pita chips.