Preheat oven to 425 degrees F.
Prepare Chili Filling: Heat large ovenproof nonstick or cast-iron skillet over medium-high heat. Add turkey, onion, bell pepper, chili powder and cumin. Sauté until turkey is browned, about 5 minutes. Drain off liquid.
Add tomato sauce and beans. Taste and adjust seasonings, adding salt and pepper as needed, as well as additional chili powder or cayenne.
Spread cheese over chili.
Prepare Cornmeal Topping: In blender, combine corn and buttermilk and process until fairly smooth. Blend in egg whites.
In medium bowl, combine cornmeal, flour, sugar, baking powder and salt. Mix well. Pour in buttermilk mixture and stir just until well moistened. Spread batter over chili mixture in skillet.
Bake for 20 to 30 minutes, until topping is golden and firm. (Batter with frozen corn will take longer to bake than batter with fresh corn.) Let stand for about 5 minutes before serving with pie server or spoon.