Preheat oven to 350�F and prepare cake pans by greasing and lining with parchment paper.
Whisk together dry ingredients in a mixing bowl.
Mix in carrots, eggs, butter, and vanilla extract until combined.
Stir in pecans.
Scoop batter into pans and bake according to size until set in the middle.
Let cakes cool completely before frosting.
Make frosting by whipping together cream cheese, butter, vanilla, sour cream, and powdered sweetener.
Top with nuts if desired.