Preheat your oven to 350℉
In a large bowl whisk together the melted butter, oil, sugar, brown sugar and vanilla extract until smooth.
Whisk in the 2 eggs until totally incorporated then whisk in the yogurt, sour cream or buttermilk.
In a separate bowl whisk together the flour, baking powder, baking soda, salt and cinnamon.
Add the grated zucchini and toss to coat with the flour mixture.
Fold the flour mixture into the wet ingredients until just combined.
Gently fold in the walnuts and chocolate chips.