How do I keep the cookies round?

Name: Cranberry Orange Icebox Cookies
Prep time: 10 min
Cook time: 10 min
Total time: 260 min
Ingredients: 2 ¼ cups all-purpose flour (270 g); ½ teaspoon salt (3 g); ¼ teaspoon baking powder (1 g); ¾ cup brown sugar (150 g); ½ cup powdered sugar (60 g); 1 large egg (room temperature); 1 cup butter - salted (room temp (226 g)); 2 teaspoons vanilla (10 ml); ⅔ cup dried cranberries (85 g or 1 cup fresh, minced (100 g)); 1 tablespoon orange zest (6 g); ½ cup powdered sugar (60 g); 1 tablespoon fresh orange juice (15 ml); ¼ teaspoon vanilla (1 ml)

Question

Accepted Answer

Slice while the dough is firm and rotate the log every few slices to avoid flattening one side.