What ingredient contribute most to the texture of crisp cookies?

The ingredient that contributes most to the texture of crisp cookies is typically granulated sugar. When baked, granulated sugar helps create a crunchy exterior by promoting caramelization and moisture evaporation. Additionally, the fat used, such as butter, can also influence texture; a higher ratio of fat can lead to a more tender cookie, while less fat combined with more sugar can result in a crisper texture.