What is the origin of the idiom "be cooking with gas" and when to use it?

The phrase "be cooking with gas" comes from the mid-20th century, when gas stoves and ovens became popular for cooking. The phrase originally meant to be using gas appliances for cooking, which was seen as more efficient and effective than using other methods such as wood or coal. Over time, the phrase came to represent any situation where things are going well and progress is being made. It can be used to describe progress or success in any number of endeavors, from a project at work to personal goals or achievements.