Prep. Preheat the oven to 400F. Spray the inside of a 9 by 13-inch casserole dish with cooking spray.
Make the cornstarch slurry. Whisk together the cornstarch and half and half in a small bowl to form a slurry.
Mix everything. Whisk together the cornstarch slurry, melted butter, eggs, sugar, drained corn, creamed corn, salt, pepper, baking powder, and vanilla in a large bowl.
Bake. Pour the mixture into the prepared dish and bake until it’s golden on top but still jiggly in the center, and a paring knife inserted into the middle comes out clean, about 30 to 40 minutes.
Enjoy. Sprinkle the chives on top and serve warm.
Video
Notes
Storage: Store this covered in the fridge for up to 5 days or wrapped well in the freezer for up to 3 months.
Reheating: To reheat, thaw the casserole if it was frozen. Put however much you want to reheat into an oven safe dish and heat it (uncovered) at 350F until warm throughout. If you're reheating the entire casserole, cover it with foil and reheat for 20 minutes, then remove the foil and continue reheating (uncovered) until it's warm throughout, about 10 to 20 minutes more.