Preheat oven to 350 degrees Fahrenheit.

In a medium-sized mixing bowl, mix sugars and oil. Stir in the eggs.

In a small bowl, combine flour, vanilla sugar, baking soda, and salt. Add dry mixture to the wet mixture and mix well.

Remove one cup of dough and place in a separate bowl. Add pudding mix and mix until incorporated.

Stir chocolate chips into the lighter dough.

Remove half of the lighter dough and form two 2×12-inch loaves on a lined baking sheet, spread apart. Split the darker dough in half and spread over the two loaves. Cover the darker layer with remaining lighter dough.

Bake for 20–25 minutes.