You may feel like the dough is going to be too dry when you start adding the flour (the mix can look very crumbly at first).
Just keep going on low speed until all the flour is incorporated, and you should end up with a soft cookie dough that doesn't crack when rolling into balls.
Note: Measure the flour correctly! Spoon the flour into the measuring cup to fluff it up, then level with the back of a knife. Don't scoop it with the cup, or you may use too much flour and end up with dry and crumbly dough.
How to fix dry cookie dough: If this happens, add a teaspoon of neutral vegetable oil and combine slowly. Add a little more oil if necessary until your dough is soft and pliable.
I use a small bowl to roll the dough balls in sugar, I find it sticks easier that way vs when the sugar is all spread out in a larger bowl.
Do be fast when adding the chocolate after baking - otherwise it won't stick as well. See my notes below this image for more tips to get this kiss thing down perfectly ;-)
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