Preparation

• Preheat your oven to 350°F and prepare a 9-inch round cake pan by greasing and flouring it.
• In a large mixing bowl, combine the brownie mix and all-purpose flour. Stir well to combine.
• Add the vegetable oil, water, and eggs to the dry mixture. Using an electric mixer, beat until the batter is smooth and well-incorporated.
• If using, gently fold in the chocolate chips and walnuts, ensuring they are evenly distributed throughout the batter.
• Pour the batter into the prepared cake pan, smoothing the top with a spatula to ensure even baking.
• Place the pan in the preheated oven and bake for 35 to 40 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
• Once baked, remove from the oven and allow the brownies to cool in the pan for about 10 minutes before transferring them to a wire rack to cool completely.
• Cut the cooled brownies into slices and serve as desired. Consider pairing with ice cream or adding your favorite toppings.
• Store any leftover brownies in an airtight container at room temperature for up to 3 days, or refrigerate for longer freshness.