Mix butter and sugar and whisk it till fluffy
Add baking soda and baking powder and mix it
Add vanilla essence and flour and fold it well
Add half amount of choco chips and mix
Refrigerate it for 10 minutes
After 10 minutes take it out and make balls from it
Arrange on the greased tray and slightly press it to flatten it
Put some choco chips on it and slightly press it
Bake it on convection mode at 180 degree for 15-18 minutes
