Step 1: Preheat oven to 375°F (190°C) and grease a 2-quart baking dish.
Step 2: In a medium saucepan, combine cornmeal, milk, butter, salt, and sugar. Cook over medium heat, stirring constantly, until thickened (about 5-7 minutes).
Step 3: Remove from heat and let cool slightly (about 5 minutes). Stir in egg yolks and baking powder until well combined.
Step 4: In a separate bowl, beat egg whites until stiff peaks form.
Step 5: Gently fold beaten egg whites into the cornmeal mixture until just combined.
Step 6: Pour batter into prepared baking dish and bake for 30-35 minutes, until golden brown and set.
Step 7: Serve immediately while warm, using a spoon to scoop portions.