If you want a thicker cookie, my tips are to make sure that you've whipped your sugar and butter together long enough to incorporate them fully. This will help them from spreading too much. My other tip is to stack the dough balls. Use a scoop to make one cookie ball, flatten it even so slightly. Then, scoop another ball and squish it onto the top so they are stuck together. Place in the oven and bake for an additional few minutes. Take out when golden brown. Refer to the photo below for a visual.