Begin by preheating your oven to 350°F (175°C). Prepare a 9-inch round cake pan by lightly greasing it or lining it with parchment paper for easy removal after baking.
In a large mixing bowl, combine the rolled oats, baking powder, baking soda, ground cinnamon, ground nutmeg, and salt. Whisk them together until well combined, ensuring there are no clumps.
In a separate bowl, whisk together the grated carrots, unsweetened applesauce, honey or maple syrup, Greek yogurt, eggs, and pure vanilla extract until the mixture is smooth and fully incorporated.
Carefully pour the wet ingredients into the bowl with the dry ingredients. Stir gently until just combined—be cautious not to over-mix, as this can lead to a denser cake.
If you like, fold in the chopped walnuts or pecans and raisins to add texture and flavor to your cake.
Transfer the batter to the prepared cake pan, using a spatula to spread and smooth the top evenly.
Place the pan in the preheated oven and bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean. Keep an eye on the cake as it nears the end of baking to avoid overcooking.
Once baked, let the cake cool in the pan for 10 minutes. Afterward, gently transfer it to a wire rack to cool completely before slicing.
Notes
For a beautiful finish, dust the cooled cake with a light sprinkle of powdered sugar. Garnish with grated carrots and walnuts. Serve with Greek yogurt for extra creaminess.