Preheat your oven to 350°F (175°C) and prepare a 9x13-inch baking dish by greasing it lightly.

Peel, chop, and boil about 2 medium sweet potatoes for 15-20 minutes until fork-tender, then mash and cool slightly.

Combine 1 cup of all-purpose flour with half of the chopped pecans in a mixing bowl and stir well.

In a large mixing bowl, combine the cooled mashed sweet potatoes, brown sugar, melted butter, eggs, vanilla extract, ground cinnamon, and salt. Whisk until smooth.

Gradually add the flour-pecan mixture to the sweet potato filling, folding gently.

Pour the mixture into the prepared baking dish, spreading evenly. Sprinkle remaining chopped pecans on top.

Bake for 30-35 minutes until edges are set and the center slightly firms. A toothpick should come out clean or with a few crumbs.

Allow the bars to cool in the pan for about 15 minutes before slicing into bars and serving.