01 - Heat the oven to 350°F (180°C).
02 - Combine cream cheese, sour cream, and mayonnaise in a large mixing bowl; mix until smooth.
03 - Add drained spinach, garlic, green onions, Parmesan, mozzarella, salt, pepper, nutmeg, and chili flakes. Stir until fully combined.
04 - Spread the mixture evenly into a lightly greased baking dish or ovenproof skillet.
05 - Bake for 20 minutes until the top is bubbly and golden.
06 - Allow to cool slightly before serving warm alongside crackers, bread, or fresh vegetables.