Heat oven to 400 degrees. In small bowl, mix cornstarch, sugar, onions, mustard, sea salt and chili pepper until well blended; set aside.
In large bowl, lightly beat eggs. Stir in milk, butter and all corn. Gently stir in cornstarch mixture until well blended. Pour into 2-1/2-quart baking dish sprayed with nonstick cooking spray.
Bake 1 hour, or until set, stirring halfway through cooking. Let stand 10 minutes before serving.