Preheat oven to 350°F (175°C). Line an 8×8-inch baking pan with parchment paper.
In a large bowl, add sweet potato purée, nut butter, maple syrup, eggs, and vanilla extract. Mix until smooth.
Add cocoa powder, baking soda, and salt. Stir gently until just combined.
Fold in chocolate chips.
Pour batter into prepared pan and spread evenly. Top with extra chocolate chips.
Bake for 25–30 minutes, until edges are set and the center is slightly soft.
Let brownies cool completely in the pan before slicing for the best texture.