What will happen if you use one less cup of flour than your cookie recipe calls for?

If you use one less cup of flour than your cookie recipe calls for, the cookies will likely be thinner and crispier. This is because flour acts as a thickening agent in baking, and reducing the amount of flour will result in a less viscous dough. As a result, the cookies will spread out more when they bake, resulting in a thinner texture. Additionally, the cookies may be more crumbly and delicate, as they will not have as much structural support from the flour. The flavor of the cookies may also be affected, as the flour contributes to the overall taste and texture of baked goods.