Preheat the oven to 350 degrees Fahrenheit. Line a 9×13 pan with parchment paper, and lightly grease with nonstick spray. Set it aside.
Add the melted butter and sugars to a large bowl and mix them together. 1 cup Unsalted Butter, 1 1/3 cup brown sugar, 1/2 cup granulated sugar
Add in the egg, and vanilla extract and stir until just combined. 1 large egg, 1 TBS vanilla extract
Add in the dry ingredients; the flour, cinnamon, baking soda, salt, ginger, and nutmeg. And mix until you have a nice cookie dough. 2 3/4 cup all purpose flour, 2 tsp ground cinnamon, 1 tsp baking soda, 1/2 tsp salt, 1/2 tsp ground ginger, 1/2 tsp ground nutmeg
Add in the shredded carrots and fold them evenly into the cookie dough. 1 cup freshly shredded carrots
Press the batter into the prepared pan, pressing the top down evenly.
Bake the bars for 20-25 minutes, or until a toothpick inserted in the middle comes out clean.
Let the bars cool completely before frosting.