Preheat oven to 180°C (350°F) and line the bottom of a 24cm (9 inch) springform tin with baking paper and grease the edges with a little butter.
Using an electric mixer cream together the butter, sweetener and orange zest for about 3 minutes on high speed. It will go creamy and smooth.
Add the cheese and mix on medium speed to combine.
Add the eggs one at a time. Mixing after each egg.
Then add the orange juice and vanilla, mix until well combined.
Sift in the flour, baking powder, baking soda and salt. Mix on medium-low speed, being careful to not over mix.
Transfer batter into the prepared tin. Bake for 35 minutes or until cooked. Allow to cool in the pan, if you move it too soon it may break (still yum, not as pretty).
To make it extra pretty, sift a little icing sugar on top. Enjoy!