Preheat the conventional oven or Instant Pot Omni Plus oven to bake at 350 degrees F for 15 minutes (although you may not use all of this time for melting the butter).
Place the butter in an 8-inch baking pan or cast-iron skillet and melt in the oven for approximately 5 minutes.
While the butter is melting, combine the Jiffy box mix, crushed pineapple, pineapple juice, sugar, and cream cheese in a medium-size mixing bowl.
Pour the melted butter from the baking pan into the mixing bowl and mix all the ingredients.
Pour the cornbread mixture into the pan.
Bake at 350 degrees F. In the conventional oven for 20-25 minutes. Instant Pot Omni Plus oven for 15-18 minutes.
Serve sweet cornbread warm, and enjoy!
