Preheat oven to 350°. Combine 1 1/2 cups mozzarella, sour cream, 2 tablespoons Parmesan, and next 6 ingredients (through spinach) in a large bowl; stir until well blended. Spoon mixture into a 1 1/2-quart baking dish. Sprinkle with remaining 1/2 cup mozzarella and remaining 2 tablespoons Parmesan. Bake at 350° for 30 minutes or until bubbly and golden brown. Serve with tortilla chips.