Preheat your oven to 350°F (175°C) and prepare a 9x13 inch baking pan by greasing it lightly or lining it with parchment paper.

In a medium bowl, whisk together the all-purpose flour, baking soda, salt, ground cinnamon, and ground nutmeg until well combined.

In a large bowl, combine granulated sugar, brown sugar, and vegetable oil, whisking until light in color and consistency.

Incorporate the large eggs one at a time into the wet mixture, whisking well after each. Stir in vanilla extract.

Gently fold the dry ingredients into the wet mixture until just combined.

Add the finely shredded carrots, chocolate chips, and mixed dried fruit. Fold gently until evenly distributed.

Pour the batter into the prepared pan and spread evenly. Bake for 30 to 35 minutes, or until a toothpick comes out clean.

Remove from oven and cool in the pan for 30 minutes before transferring to a wire rack to cool completely.

Make frosting by beating cream cheese and butter until smooth. Gradually add powdered sugar and mix until fluffy.

Spread the cream cheese frosting over the cooled bars and garnish if desired.

Chill in the refrigerator for at least 1 hour before cutting into squares or rectangles and serving.