Identify the Last Event in Baking Cookies

Lucy loves to bake. One Saturday morning, she decided to make chocolate chip cookies. First, she gathered all the ingredients: flour, sugar, butter, chocolate chips, and eggs. After that, she preheated the oven to 350 degrees Fahrenheit. Once the oven was ready, she mixed the flour, sugar, and butter together in a bowl. Next, Lucy added the eggs and stirred until the mixture was smooth. Finally, she folded in the chocolate chips and poured the batter onto a baking tray. After placing the tray into the oven, Lucy set a timer for 10 minutes. When the timer went off, she carefully removed the tray and let the cookies cool before tasting her delicious creation.