Preheat oven to 350°. Grease and flour a 13x9-inch pan.
In a medium bowl, sift together flour, baking soda, ginger, baking powder, salt, and cinnamon; set aside.
In a large bowl, combine brown sugar and butter; beat at medium speed with an electric mixer until fluffy. Add sweet potato, milk, molasses, eggs, and vanilla, beating to mix well. Gradually add flour mixture to sweet potato mixture, beating until combined.
Spoon batter into prepared pan. Bake for 30 to 40 minutes or until a wooden pick inserted in center comes out clean. Let cool in pan for 10 minutes. Remove from pan, and cut into 12 squares. Serve warm with Maple Pecan Butter Sauce.
Recipe by Southern Lady Magazine at https://southernladymagazine.com/sweet-potato-gingerbread-with-pecan-butter-sauce-recipe/