Task: Question Answering
Input (English): Omelettes are one of my favorite breakfast foods, so I grabbed a skillet's from the pantry, place it on the skillet and turned on the heat to medium in order to get ready to cook them. While the skillet was heating up, I cracked two eggs, and the and the contents of the shell into an empty bowl and discarding the white cells. I beat the eggs until the yoke and egg white had combines, then added a few splashes of milk and continued beating. Once I was satisfied with the consistency of the egg of the omelette, then I prepared the contents that will go inside. I already had a bacon that have been cooked previously, so I crushed the bacon with my hands in order to make crumbles. I also grabbed a bag of cheddar cheese from the refrigerator, as well as an onion. I cut a few slivers of onion off, and chop them into fine pieces. Now that I have all of my ingredients prepared, I pour the egg into the preheated skillet and let the egg cover the bottom surface of the skillet. Once I felt the ad was halfway cooked, I use a spatula to lift and flip the egg over to the other side. Immediately after flipping the egg, I placed my crumbled bacon, diced onion, and shredded cheddar cheese on one side of the circular cooking egg. I then use my spatula to close the omelette, flipping the uncovered side of the egg on top of the bacon, cheese and onion that was situated on the other side of the egg. Once the egg was properly closed, I then use a spatula to turn the omelette over so that it may continue cooking on the other side, and turning off the heat. After about 40 seconds of cooking, I then use a spatula to remove the omelette from the skillet, and place it on the plate so I can begin eating. 
Question: When did they add the eggs to the pan?
Output (English): When the skillet was heated up