If you have a Convection Microwave Oven and if you are using the convection mode, use same settings as that for an oven.
Please see this recipe of Eggless Vanila Cake
Maida - 250 gm, Icing sugar - 2 1/2 tsp, Sugar - 200 gm (powdered), Butter - 300 g (plain unsalted), Baking powder - 2 tsp, Cooking soda - 1 pinch, Vanila essence - 4 tsp, Pineapple essence - 2 tsp (for additional flavour), Milk - 200 ml (Whole milk)
In a suitable shallow bowl, take butter and microwave it in low (or reheat) mode for 1 - 2 mins until the butter melts. Ensure that the butter is just about melted and doesn`t burn. Let the butter cool. Add icing sugar and beat it well for 10 mins. While adding milk little by little, add sugar powder, baking powder, cooking soda, flour and mix well.
Add vanila essence, pineapple essence and mix and beat the batter for 20 mins.
Pre-heat the microwave Oven in Convection mode for 3 mins.
Take a greased microwave safe bowl (similar to Borosil(r)) and heat for about 2 mins. Remove the bowl and pour the batter into the bowl and place back in the Microwave oven for 7 - 8 mins set to 160 degrees Celcius in Convection mode, in "Microwave Only" option.
After this, let it stand for about 2 mins before removing the bowl out from the oven.
After removing the bowl, tip it upside down on a large plate and leave it for 10 mins.
Slowly pull up the bowl off the plate to leave the cake.
You can also see this link to know about tips for using Convection mode of Microwave
To use convection mode you just turn the knob to convection mode, preheat at reqd temp, and then use the provided pans.
You can also see
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