Appliance tip of the week.
How to change a standard controlled oven temp:

Sometimes the temp ( 300-350-etc ) knob will have screws on the back of the knob, you can loosen these screws and adjust the knob to match the oven temp. Picture is here. Some oven controls have a hollow shaft, you will need a tiny straight screw drive to adjust the oven temp by changing the setting screw at the bottom of the hollow shaft.

Oven Temperature Calibration

A very common Electronic control with scroll arrows or a turn dial for setting the oven temperature:

Appliance tip of the week - Oven temp changing-clockmay1-jpg

To adjust calibration:

Press BAKE pad
Select any temperature above 500 degrees F
QUICKLY press and hold the BAKE pad approximately 5 seconds until "00" or the previously entered temperature is displayed
Tap the arrow up or down pad to change the oven temperature +35 or -35 degrees in 5 degree steps.*

* Some clocks have a turn dial instead of arrow pads

A common GE clock/control

Appliance tip of the week - Oven temp changing-geclocknew-jpg

How to adjust the temp on this control

Ensure the selector switch is turned off
Hold the up and down arrows at the same time for 5 seconds until flashing "00" is displayed
Press up arrow to increase temperature in the oven
Press down arrow to decrease temperature in the oven
Once the temperature is changed, once neither up or down pad has been pressed for 5 seconds the clock will save the new temperature and go back to the time of the day.

A common GE clock/control

Appliance tip of the week - Oven temp changing-geclock052003-jpg

Press: Bake and Broil at the same time for two seconds until the display shows "SF"
Press: Bake once to increase temperature
Press: Bake again to decrease temperature
Adjust: Temperature with: Number pads
Press: Start

The oven temperature can be adjusted up or down 35 degrees F / 20 degrees C. Use this feature if you think your oven is too hot or too cold. This adjustment will stay in memory.

Appliance parts at your mouse....I mean finger tips.