After all the flour has been added, the mixture will turn into a shaggy, soft dough. As you start to knead, the dough will start to gather in the center within 5-7 minutes in the mixing. However, if your dough stays shaggy and does not come together, sprinkle up to ¼ cup of flour gradually while the mixer is running. It should help to shape the dough into a formed mass that cleans the side of of the bowl.