Preheat the oven to 350°F (175°C).
Peel & shred carrots using food processor with grating attachment or by hand with a box grater. Run a knife through the shredded carrots to break them down further.
In a large bowl, whisk together flour, baking powder, baking soda, salt, cinnamon, ginger, nutmeg. Set aside.
In the bowl of a stand mixer, combine sugars, oil, vanilla, eggs, & applesauce. Mix until well combined.
Add dry ingredients to the wet ingredients in the stand mixer bowl. Mix on medium-low until no lumps remain.
Mix in shredded carrots until evenly distributed in the batter, scraping down sides once.
Divide batter evenly between two 9" springform pans lined with parchment paper on bottom, sprayed with pan spray, & placed on a sheet tray
Bake in preheated oven for 60-70 minutes or until a cake tester comes out clean.
Allow the cakes to cool completely in the pans for about an hour then cover and freeze for 30 minutes to 2 hours to firm up.
While the cakes cool, prepare frosting. In a stand mixer fitted with the whisk attachment, combine room temperature cream cheese, butter, vanilla extract, salt, & sour cream. Whip until smooth & creamy.
Add in powdered sugar & cornstarch, mixing for about a minute smooth and lump-free.
Refrigerate the frosting in a ziploc or piping bag to set while preparing the cakes.
Remove the cooled cakes from the pans and trim off the top and bottom to create flat surfaces. Place a bowl or other round thing that's just smaller than the cakes on top and use it as a guide to cut off the edges of the cakes, creating vertical sides.
Freeze for 15-20 more minutes to firm
Place cake on a cake decorating turntable (or a flat plate). Apply a dab of frosting directly to the turntable to keep cake from moving. Swirl a ½" layer of frosting on top and spread in a flat layer from edge to edge. Add cake 2 on top.
Apply a thin layer of frosting all over the stacked cakes to seal in crumbs. Refrigerate or freeze the cakes for 25 minutes to set the crumb coat.
After cooling, apply a generous layer of cream cheese frosting to the cakes, ensuring even coverage.
Press toasted chopped pecans onto the sides of the cake Scrape off any excess pecans from the bottom edge of the cake.
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