Preheat the oven to 350F then line a 8.5x4.5 loaf pan with parchemnt paper and set aside.
in a large bowl, mash the bananas then whisk in the brown sugar, grnaulated sugar, sour cream, vanilla extract and oil untli combined.
3 ripe bananas, 1/2 cup granulated sugar, 1/3 cup brown sugar, 1/4 cup greek yogurt or sour cream ,, 1/2 cup oil, 1 tbsp vanilla extract
Add in the flour, cinnamon, nutmeg if using, baking powder, and baking soda.
1 & 3/4 cup flour, 2 tsp cinnamon, 1/2 tsp nutmeg, 2 tsp baking powder, 1/2 tsp baking soda
Fold in the chocolate chunks then pour the batter in the prepared baking pan. Bake in the preheated oven for 53-55 minutes or until a wooden skewer inserted in the center comes out clean.
4 oz chocolate chunks
Allow the loaf to cool down before slicing into it and enjoying.