Preheat the oven to 180 degrees. Line a 9x5inch loaf tin with baking paper and grease with butter.
Start By Preparing The Cookie Layer:
Cream together the butter and sugars.
Fold in the flour
In a small bowl, mix together the baking soda and boiling water until foamy; add this into the flour and butter mix, and fold well.
Lastly, mix in the chocolate chips.
Spread a 1.5 inch layer of cookie dough into the loaf pan. Don’t worry if you have extra, you can roll them out into balls and bake separately to make cookies.
For The Cake Layer:
Sift together the flour, baking soda and cocoa powder into a large bowl.
Mix in the sugar.
Add the milk, oil and vinegar and fold to combine.
Pour this batter over the cookie dough layer, and fill until the pan is full ¾ of the way.
Sprinkle over some chocolate chips.
Bake for around 30 minutes or until a toothpick inserted comes out clean.
Allow the cake to cool completely before de-moulding and slicing. This cake is best served warm with a scoop of ice cream!
Notes
Any left-over batter can be baked separately in the shape of cookies and brownies.