Preheat your oven to 350°F. In a large microwave-safe bowl, heat the cream cheese and sour cream on HIGH for 1 minute or until the cream cheese is soft. Remove from the microwave and whisk until smooth.
Incorporate the refried beans, green chiles, taco seasoning mix, and 2 cups of the shredded cheese into the bowl, stirring until well combined.
Transfer the bean mixture to a 13x9-inch baking dish that has been sprayed with non-stick cooking spray. Top with the remaining 2 cups of cheese.
Bake for 25 minutes, or until the cheese is fully melted. Garnish with chopped green onions and sliced black olives. Serve with tortilla chips.