Panko Crusted Spinach Dip

Name: Panko-Crusted Spinach Dip
Ingredients: For the dip:; Three 16-ounce bags frozen spinach, defrosted and drained; 8 ounces (1 cup) sour cream; 1/2 cup mayonnaise; 2/3 cup grated Parmesan cheese; 1/2 teaspoon crushed red pepper flakes; 2 cloves garlic, minced; 1 teaspoon salt; Two 8-ounce packages cream cheese, at room temperature; For the topping:; 1/4 cup panko; 1/4 teaspoon salt; 1/4 cup grated Parmesan cheese