Preheat the oven to 350°F. Grease a 9x9-inch baking dish with cooking spray.
In a bowl, mix together the Greek yogurt, creamed corn, thawed corn, melted butter, and eggs. Add the cornbread mix, salt, and pepper, and stir.
Pour the batter into the prepared baking dish. Sprinkle the top of the batter with the sugar. Bake for 45 minutes, until the sides are golden and the middle is slightly firm when you shake the pan.