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