Spray a 7” cake pan or springform pan well with cooking spray or grease it with butter.
In a medium bowl, whisk together the eggs, buttermilk, and butter until frothy.
Combine the cornmeal, flour, white sugar, brown sugar, baking powder, baking soda, salt, and sage in a large bowl.
Add the egg mixture and stir to combine.
If desired, add in the cheese.
Pour batter into the prepared pan, and wrap tightly in foil.
Pour one cup of water into your Ninja Foodi, and place the trivet on top.
Place the prepared pan on the trivet.
Put the pressure cooking lid on your Ninja Foodi, and set the timer for 50 minutes.
When the time is up, allow the pressure to release naturally - at least 10 more minutes, and then remove the lid.
Wipe off any moisture that it on the foil, and then remove the pan from the Foodi.
Unwrap, and transfer to a cooling rack. Allow to cool in the pan for 15 minutes, and then remove from the pan.
Serve warm with butter.