Snickerdoodle Cookie Bars🥛 This cookie bar is super soft and easy to make! They are perfect for a holiday party. Full recipe below. Cookie Dough: * 16 tbsp, unsalted butter softened * 3/4 cup granulated sugar * 3/4 cup light brown sugar * 2 large eggs * 1 tsp vanilla extract * 2 2/3 cups all purpose flour * 1 tsp cream of tartar * 1 tsp baking soda * 1/4 tsp salt * 2 tbsp cinnamon sugar Frosting: * 16 tbsp sticks unsalted butter, softened * 3 1/2 cups powder sugar * 2 tbsp cinnamon sugar * 1 ts