Yes, resting pancake batter for 5-15 minutes allows the gluten to relax and the leavening agents to work, resulting in lighter and fluffier pancakes.
Resting pancake batter is a crucial step for achieving the best texture. When you mix the ingredients, gluten develops. Gluten is a protein found in wheat flour that, when hydrated and agitated, creates elasticity. Too much gluten development in pancake batter leads to tough, chewy pancakes. Resting the batter allows the gluten strands to relax, resulting in a more tender crumb.
Furthermore, resting gives the leavening agents (baking powder or baking soda) time to work. These agents produce carbon dioxide bubbles, which create the light and airy texture we desire in pancakes. Resting allows these bubbles to form and distribute evenly throughout the batter.
During the resting period, the flour also fully hydrates. This ensures that the pancakes cook evenly and prevents a gritty texture. A resting time of 5-15 minutes is generally sufficient. Longer resting times (over 30 minutes) can sometimes lead to a denser pancake as the leavening agents lose their effectiveness.
Avoid overmixing the batter! Overmixing develops too much gluten, even with resting. Mix just until the dry ingredients are incorporated, and don't worry about small lumps; they will disappear during the resting period.