For an extra layer of flavor, consider browning the butter before adding it to the dough. This will impart a nutty and rich taste to the buns. Don't over-knead the dough, as this can result in tough buns. The dough should be smooth and elastic, but still slightly sticky. If you don't have a stand mixer, you can knead the dough by hand. It will take a bit longer, but the results will be just as delicious.