Spread is desirable in some cookies, while others must hold their shape. Several factors contribute to spread or the lack of it.
- High sugar content increases spread. Coarse granulated sugar increases spread, while fine sugar or confectioners’ sugar reduces spread.
- High baking soda or baking ammonia content encourages spread.
- The creaming together of fat and sugar contributes to leavening by incorporating air. Creaming a mixture until light increases spread. Blending fat and sugar just to a paste (without creaming in a lot of air) reduces spread.
- Low oven temperature increases spread. High temperature decreases spread because the cookie sets up before it has a chance to spread too much.
- A slack batter—that is, one with a high liquid content—spreads more than a stiff dough.
- Strong flour or activation of gluten decreases spread.
- Cookies spread more if baked on heavily greased pans.