On low speed slowly add to the butter mixture, alternating with little bits of milk (beginning and ending with the dry ingredients), mixing each addition until just incorporated. (cookingactress.com)
Add a tiny bit of milk in the bowl, just use your eye and estimate half the size of your fist. (fb101.com)
I kept the tiny bit of milk cold to keep it for the morning when I could take it to my daughter. (romper.com)