I use to make cupcakes using a Donna Hay recipe. When I didn't have the time or just couldn't be bothered making that extra effort I would buy the Green's buttercake packet mix. I think it is nicer than the White Wings one.

375g butter
1 and a half cups caster sugar
1 teaspoon vanilla extract
6 eggs
3 cups plain flour
1 tablespoon baking powder

Pre heat oven to 160. Place butter, sugar and vanilla in bow and beat until light and creamy.
Add the eggs, two at a time, beating well.
Sift the flour and baking powder over the butter mixture and mix until combined.
Fill patty cases until 3/4 full and bake for 35 minutes or until cooked when tested with a skewer.