Muffins will be done when they have a lightly golden top and a toothpick comes out clean without any batter on it. As every oven heats a little differently, we always set our timer for about 3 minutes less than the instructions. Then, start to check the muffins and add more time as needed. You can always bake a little longer, but you can’t fix over baked muffins. If you touch the top of the muffins, they should spring back.