Creaming the butter, sugar and then mixing the eggs in is the most important part of the cookie dough mixing process. Creaming is when you fully incorporate the butter and sugar together and add some much needed air to the dough. We recommend creaming the butter and sugar for 2 minutes on medium-high speed and then mixing the butter/sugar/eggs for another 3 minutes at the same speed. Once you add the flour, you want to mix the dough as little as possible. Mix it too much and you will get tough cookies. Mix in the flour on low speed and continue mixing ONLY until the dry ingredients are incorporated into the dough. Make sure you scrape down the sides and the bottom to make sure all the flour has gotten mixed in.