Using a cookie scoop will help tremendously in shaping your cookies perfectly, as they start out in a perfect ball shape and will spread evenly in the oven. Using a cookie scoop also ensures your cookies bake evenly, as they will all be the same size. When that is not possible, you can try this hack for shaping cookies after baking them. Use a large circle cookie cutter that is LARGER than the cookie itself. Place the cookie cutter around the cookie when it is straight out of the oven. Then, carefully move it around the hot cookie in a circular motion, shaping the edges to make it perfectly circular. You can also use the back side of a large spoon to carefully tuck in the edges of a cookie when it's hot and shape it into a circle.