Preheat the oven at 350°F or 180° C.
Prepare one 9x5 inches loaf pan with nonstick spray or homemade pan release and set aside.
In a large bowl, whisk together flour, pecans, baking powder, salt, cinnamon, nutmeg and set aside.
In a different bowl, add mashed potato, yogurt, eggs, vegetable oil, vanilla extract, and whisk together until well mixed.
Add the sweet potato mixture to the flour mixture and mix until there is no traces of flour in the mixture. Do not overmix the mixture at this point.
Pour the sweet potato bread mixture into the prepared loaf pan.