Step 1: Preheat your oven to 350°F (175°C). Lightly grease and flour two 9-inch round cake pans.
Step 2: In a large mixing bowl, whisk together the flour, granulated sugar, baking powder, baking soda, cinnamon, nutmeg, and salt until they are thoroughly combined.
Step 3: In a separate medium bowl, beat together the vegetable oil and eggs until the mixture is smooth and well-incorporated.
Step 4: Add the freshly grated carrots and the well-drained crushed pineapple (if you're using it) to the wet mixture. Stir gently until everything is evenly combined.
Step 5: Gradually pour the wet ingredients into the dry ingredient mixture. Mix them together on low speed or by hand until just combined. Be careful not to overmix, as this can lead to a dense cake.
Step 6: If you're adding them, gently fold in the chopped walnuts or pecans until they are evenly distributed throughout the batter.
Step 7: Divide the prepared cake batter evenly between your two greased and floured 9-inch round cake pans.
Step 8: Bake in the preheated oven for 25-30 minutes, or until a wooden toothpick inserted into the center of the cakes comes out clean.
Step 9: Allow the baked cake layers to cool in their pans on a wire rack for about 10 minutes before carefully inverting them onto the wire racks to cool completely. This step is crucial before frosting.
Step 10: While the cakes cool, prepare the cream cheese frosting. In a clean mixing bowl, beat the softened cream cheese and softened butter together until the mixture is light, creamy, and completely smooth.
Step 11: Gradually add the sifted powdered sugar to the cream cheese mixture, beating on low speed until fully incorporated.
Step 12: Stir in the vanilla extract and a pinch of salt. Continue beating until the frosting is smooth and fluffy.
Step 13: Once your cake layers are completely cool, place one layer onto your serving plate or cake stand.
Step 14: Spread a generous amount of cream cheese frosting evenly over the top of the first cake layer.
Step 15: Carefully place the second cake layer on top of the frosted layer. Use the remaining cream cheese frosting to cover the top and sides of the entire cake.
Step 16: Slice and serve your delicious Carrot Cake with Cream Cheese Frosting! For an extra touch, garnish with a sprinkle of cinnamon or additional chopped nuts.