Whisk together eggs, oil, milk and sugar in a large mixing bowl

Add the flour, cinnamon, bi-card soda and fold through until mixture is just combined

Add carrots, drained pineapple and walnuts. Pour mixture into a greased heat-proof microwave-safe 22cm ring pan

Place cake pan onto the turntable in the microwave

Press POWER/TIME button three times for 50% and select 17 minutes cook time. Press START/+30 SEC button

Stand cake for 10 minutes and check that cake is cooked with a skewer. Remove from pan and cool completely on a cake rack. If cake has moist spots on the surface; place absorbent paper on top during standing time

Using an electric mixer beat butter, cheese and vanilla on a medium speed for about 1-2 minutes or until well combined

Reduce speed and add sugar; once added increase speed again until mixed well

Spread on cooled cake