Preheat oven to 350°F. Wrap cornbread in foil and bake for 10 minutes. Dot with butter or spritz with water for extra moisture
Melt 1 tablespoon of butter over medium-low heat in a cast iron skillet. Toast cornbread on one side for 3-4 minutes. Flip and grill an additional 1-2 minutes.
Wrap cornbread in a moist paper towel and microwave on half-power for 45 to 60 seconds.
Wrap cornbread in aluminum foil and air fry at 350°F for 4-5 minutes.
Place slices of cornbread in the toaster and toast for 2-3 minutes.
Wrap cornbread in aluminum foil and place inside Instant Pot. Select "Keep Warm" setting and heat for 5-10 minutes.