1. Spray a 20cm round cake tin with cooking spray and line with non-stick baking paper.
2. Preheat oven to 180 C / 350°F.
3. Place all ingredients into bowl of electric mixer.
4. Beat on slow until everything is combined, then increase speed to medium and beat for 3 minutes.
5. Pour into tin.
6. Bake for 40 minutes or until a skewer inserted comes out clean.