01 - Preheat oven to 375°F and grease a 9x9-inch baking dish or casserole dish.
02 - In a large mixing bowl, whisk together cornmeal, all-purpose flour, granulated sugar, baking powder, baking soda, salt, Cajun seasoning, and smoked paprika.
03 - In a separate bowl, beat the eggs lightly, then add whole milk and melted unsalted butter. Mix until well blended.
04 - Incorporate the wet ingredients into the dry mixture and stir just until combined, avoiding overmixing.
05 - Gently fold in the sweet corn, diced red bell pepper, chopped onion, sliced green onions, and 1 cup of shredded cheddar cheese.
06 - Pour the batter into the prepared baking dish and smooth the surface.
07 - Sprinkle the remaining 1/2 cup of shredded cheddar cheese evenly over the top.
08 - Bake for 30 to 35 minutes, until the center is set and the top is golden brown.
09 - Allow casserole to cool for 10 minutes before serving. Garnish with extra sliced green onions if desired.