In a stand mixer, cream together softened butter and sugar until light and fluffy.
Next, pour in sourdough starter and maple syrup and mix until combined.
Turn the mixer on low and add flour and oats.
Cover with a tea towel and allow to sit in a warm place for 12-24 hours if desired, or move onto the next step for the quick version.
The next day, preheat oven to 350.
To the dough, add egg, vanilla, baking soda and baking powder to the dough.
Mix until combined.
Fold in chocolate chips.
Scoop dough onto baking sheet.
Bake for 12-15 minutes.