Step 1Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper.
Step 2In a mixing bowl, whisk together melted butter, peanut butter, maple syrup, egg, and vanilla extract until smooth.
Step 3Stir in the grated zucchini.
Step 4Add cocoa powder, baking soda, salt, and flour. Mix until fully combined and smooth.
Step 5Fold in the mini chocolate chips.
Step 6Spread the batter evenly into the prepared pan. Sprinkle additional chocolate chips on top if desired.
Step 7Bake for 22–25 minutes, or until the center is just set.
Step 8Allow brownies to cool completely before slicing for the best texture.
