Western desserts - Banana and chocolate cake

Banana and chocolate cake

 1 - ¾ cup flour

½  cup of powdered milk

1 teaspoon baking powder

½  teaspoon baking soda

A pinch of salt

½  cup vegetable oil

½  cup of milk 

½  cup peanut butter 

½  cup brown sugar

½  cup of white sugar

3 eggs

1 teaspoon vanilla

2 bananas

1 cup chocolate chip

½  cup crushed walnuts

1 cup white chocolate, chopped with a knife