– Carrot Cake Bar – 2¼ cups all-purpose flour – 1 tablespoon ground cinnamon – 1 teaspoon baking soda – ½ teaspoon baking powder – ½ teaspoon ground ginger – ¼ teaspoon salt – 1 cup (2 sticks) salted butter softened – 1 cup granulated sugar – 1/2 cup packed light brown sugar – 2 large egg – 2 teaspoons vanilla extract – 2½ cups finely shredded carrot – 1/2 cup chopped walnut – Cream Cheese Frosting – 1 cup (2 sticks) butter softened – 4 ounces cream cheese softened – 1 pound powdered sugar – 2 teaspoons vanilla extract – 1/4 cup chopped walnut