YOUR OVEN WAS THE WRONG TEMPERATURE – WHY MY COOKIES AREN’T SPREADING
An oven temperature that is too low can prevent your cookies from spreading. If it is not hot enough, there is not enough time for the cookies to spread while in the oven.
THE DOUGH WAS TOO COLD
Chilling your dough is an important step to preventing your dough from spreading too much. However, if the dough is too cold, this may cause the cookies to not spread enough.