. Prepare the Brownie Batter:
- In a large bowl, combine brownie mix, water, oil (or butter), and eggs.
- Beat on low speed for 1 minute, then increase to medium speed and beat for 2 more minutes.
- Pour the batter into the prepared pan.
2. Prepare the Oven and Pan:
- Preheat the oven to 180°C (350°F).
- Line the baking tray with baking paper or grease the pan. Optionally, lightly flour the pan or use nonstick cooking spray.
3. Bake the Brownies:
- Bake in the preheated oven for 25 to 35 minutes.
- The brownies are done when a toothpick inserted into the center comes out clean.
4. Cool the Brownies:
- Allow the brownies to cool for 5 minutes in the pan before removing them.