Preheat oven to 450. Lightly grease a 10-inch cast-iron skillet.
In a large bowl, combine flour and granulated sugar. Using a pastry blender or 2 forks, cut cold butter into flour mixture until crumbly. Gradually add buttermilk, stirring with a fork just until dry ingredients are moistened.
On a lightly floured surface, turn out dough, and lightly knead 5 times. Pat or gently roll dough to a 14x8-inch rectangle. Brush with softened butter. In a small bowl, combine brown sugar and cinnamon; sprinkle onto buttered dough. Starting at one long side, roll up dough into a log. Cut roll into 8 (1¾-inch-thick) slices. Place slices cut side up in prepared pan.
Bake for 15 to 17 minutes or until golden brown. Brush with melted butter, if desired.
In a medium bowl, whisk together confectioners’ sugar, whole milk, and salt. For a thin glaze, drizzle onto biscuits while warm. For a thicker glaze, let biscuits cool for at least 30 to 45 minutes before glazing.
Recipe by Paula Deen Magazine at https://pauladeenmagazine.com/cinnamon-roll-biscuits-recipe/