carrot cake with maple-cream cheese frosting

INGREDIENTS

• 2 cups all purpose flour
• 2 teaspoons baking soda
• 1 teaspoon salt
• 2 teaspoons ground cinnamon
• 1/2 teaspoon ground nutmeg
• 1 teaspoon ground ginger
• 2 cups sugar
• 1 1/4 cups canola oil
• 4 large eggs
• 3 cups grated peeled carrots
• 1 cups coarsely chopped walnuts (optional)
• 1/2 cup raisins (optional)
• Two (8-ounce) packages cream cheese, softened
• 1 stick unsalted butter, room temperature
• 2 cups confectioners’ sugar
• 1/4 cup pure maple syrup