Put a lid on it

“A lid traps heat, making the most of the energy flow and cutting down on the amount of time needed to cook.”

https://mashable.com/2014/05/14/energy-efficient-apartment/?fbclid=IwAR3Jh7SEat-NMhMVwoWMtlpWj1tPwctWoBy2vX8pdAQlrJWDJMG5LKIUWWs