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 softened cream cheese, sour cream, and milk. Mix until smooth and creamy.

Fold in the drained sweet corn, shredded cheddar cheese, grated Parmesan cheese, white sugar, all-purpose flour, garlic powder, onion powder, salt, and pepper. Mix until evenly combined.

Pour the mixture into the greased baking dish, spreading it evenly.

Bake for 45–50 minutes until bubbly and lightly golden on top.

Allow to cool for 5–10 minutes before serving.

Optionally, garnish with chopped green onions or parsley before serving.