Preheat the oven to 350°F and brush a 9x9-inch baking dish with a little of the melted butter.

In a medium bowl, whisk together the flour, cornmeal, sugar, baking powder, and salt.

In a food processor, place 3 cups of the corn kernels and pulse until creamy.

In a large bowl, whisk together the melted butter and eggs, then add the sour cream and pureed corn and whisk again to combine. Add the dry ingredients to the wet ingredients and mix until just combined, then fold in the remaining corn kernels.

Pour the batter into the prepared baking dish and use a spatula to smooth the top. Bake for 45 to 50 minutes, or until the edges are golden brown and the middle is almost set.

Let cool for at least 10 minutes before serving.