Prepare the Kamado BONO grill for indirect cooking by lighting the charcoal and setting up the two-zone cooking system with a deflector. Place the stainless steel grill grates, then put the baking stone on top and wait until the temperature reaches 180°C. Adjust the top and bottom air vents to maintain an even temperature.
Mix the flour with the baking powder. Using a mixer, whip the cheese together with the butter and sugar. Add the vanilla extract, then beat in the eggs one at a time, ensuring each is fully incorporated before adding the next. Pour the batter into a buttered baking tin.
Bake at 180°C for 35–40 minutes.
Check doneness by inserting a wooden skewer into the centre; it should come out clean. Serve the cake with berries, if desired.