Now I know what gluten does

I tried to be a good wife and make Dane cookies. He has been off gluten for quite some time now due to his DH. He loves my chocolate chip cookies and I wanted to make some for him. I used my same recipe and substituted a gluten free flour for all-purpose flour. This was the result. SAD! They were paper thin, crispy and tasted like alphalpha sprouts! Now I know what gluten does.