Heat oven to 350°
Place sugar on a plate or in a shallow bowl. Take a piece of cookie dough and coat both sides of the cookie dough with the sugar. Flatten it to the size of the bottom of a muffin tin.
Put each flatten cookie into the bottom of a greased muffin tin.
Bake 14 minutes until edges are browned. Remove from oven and using small glass cup or the end of a wooden spoon handle, make a well in the center of each cookie. Return to the oven and bake for an additional 4 minutes, or until cookies are firm.
Remove from oven and let cool completely before removing the cookies from the muffin tin. Gently run a butter knife around the edges of the cookie to loosen it before removing the cookies.