Preheat your oven to 350°F (175°C).

Grease a 9x13-inch baking dish with 1 tablespoon of butter.

In a large mixing bowl, combine the softened cream cheese, sour cream, and milk. Blend until smooth and creamy.

Add the sweet corn, shredded cheddar cheese, grated Parmesan cheese, white sugar, all-purpose flour, garlic powder, and onion powder. Season with salt and pepper. Stir until well combined.

Pour the mixture into the prepared baking dish and spread it evenly.

Bake for 45-50 minutes until bubbly and golden brown.

Allow to cool for 5-10 minutes before serving.

Garnish with chopped green onions or parsley if desired before serving.