Marble chocolate chips cookies by Jeannie Lee‎

180g salted butter
180g icing sugar
2 eggs
1/4 vanilla essence
10gm cornflour
350g all purpose flour
1/2 tsp baking powder
Choco chips (optional)

Mix butter n icing sugar together. Add in eggs n follow by vanilla essence.
Add if sifted flour and baking powder and add in chocolate chips (optional)
Bake at preheated oven 170°C for 20min or till cooked.