[header] How to make rocky road brownies [title] Preheat the oven. [step] To ensure that the oven is hot enough for the brownies when you're ready to bake them, it's important to preheat it. Set the oven temperature to 350 degrees fahrenheit (177 degrees celsius), and allow it to fully heat. 
[substeps] Keep an eye on your oven so you know when it's preheated. Most models flash an indicator light or beep to alert you.