Preheat the oven to 350°F (175°C). Generously grease an 8x8-inch or 9x9-inch ceramic baking dish with 1 tablespoon of butter.
In a large mixing bowl, whisk together the lightly beaten eggs, melted butter, room-temperature sour cream, and granulated sugar until silky and smooth.
Sprinkle in the yellow cornmeal, all-purpose flour, baking powder, sea salt, and freshly grated nutmeg. Whisk gently until fully combined with no dry flour lumps.
Using a silicone spatula, gently fold in the drained whole sweet corn kernels and undrained cream-style corn until evenly distributed throughout the batter.
Pour the batter into the prepared baking dish and smooth the top evenly with your spatula.
Bake uncovered on the center rack for 45 to 50 minutes, until the edges are puffed and golden-brown, and the center is set with a subtle custard jiggle.
Remove from the oven and allow to rest on a wire rack for 10 minutes to set before scooping warm with a silver serving spoon.