Preheat oven to 350 degrees. Mix together cream cheese and sour cream in a large bowl. Mix in refried beans until combined. Stir in taco seasoning. Spray a 9x13 baking pan with cooking spray. Spread mixture evenly into the bottom of the baking dish.
Sprinkle the top with both cheeses. Bake for 25-30 minutes, or until cheese in melted and slightly browned. Serve with tortilla chips.