There are a few ways to check if your lasagna is done. You can check the temperature by poking a digital instant read thermometer in the center of the lasagna. If it is about 165°F, the lasagna is likely done. If the edges are bubbling but not watery, that is also a good sign it may be done. Lastly, use a toothpick to poke in the center, if the noodles are soft, meaning you don't feel much resistance, the lasagna is likely finished.