To preheat your COSORI Dual Air Fryer (8.5L) for 15 minutes, follow these steps:
1. **Plug in the Air Fryer**: Make sure your air fryer is plugged into a power outlet.
2. **Turn it On**: Press the power button to turn on the air fryer.
3. **Set Temperature**: Use the temperature control to set the desired temperature for preheating. Typically, a common preheat temperature is around 350°F (175°C), but you can set it to the temperature