Create topping if using and set aside. Topping instructions are below.
Preheat the oven to 350 degrees Fahrenheit. Grease an 8x4 bread pan and set aside.
In a bowl, add all-purpose flour, baking powder, pumpkin pie spice, and salt in a bowl. Set aside.
In a large bowl, brown sugar, eggs, vegetable oil, and mashed sweet potato and whisk until combined.
Add the dry ingredients to the wet ingredients and mix until combined. Pour this batter into the prepared bread pan. If using candied pecan topping, follow the instructions below.* Bake for 50 minutes or until a toothpick entered in the middle comes out clean.
Topping Instructions
Add brown sugar, salt, ground cinnamon, and water to a non-stick skillet over medium-low heat. Stir the mixture and allow the sugar to melt and start to bubble. Allow the mixture to bubble for 2 minutes.
Remove from heat and stir in the pecans. Allow the mixture to rest undisturbed for 5 minutes. The pecans will harden and candy.
Baking with candied pecans
Place the candied pecans over the bread batter in the pan and cover lightly with foil. Bake in the preheated oven for 30 minutes. After 30 minutes, remove the foil and continue to bake an additional 20-25 minutes, or until a toothpick entered in the middle comes out clean