Preheat oven to 350°F and line a 9x9-inch baking pan with parchment paper.
Whisk together the mashed sweet potato, almond butter, maple syrup, egg, and vanilla extract until smooth.
Add the cocoa powder and stir until fully combined. Fold in chocolate chips if using.
Transfer to the prepared pan and spread evenly.
Bake 20–25 minutes until the edges are set and a toothpick comes out with just a few moist crumbs.
Cool completely before slicing - this is essential for clean, fudgy brownies!