Why Do Homemade Cookies Get Hard. As others have mentioned cooking too long. Like all baked treats cookies are subject to getting stale.
Why are my cookies hard after they cool. Why Do Cookies Get Hard. There are a couple of reasons for cookies to be hard.
Over time the moisture in the cookies evaporates leaving them stiff and crumbly.
Like all baked treats cookies are subject to getting stale. Too much flour will make cookies more dense. Without knowing your recipe I can only guess. Spoon the flour into a dry measuring cup and level it off.