Following these clear steps can help you achieve a delicious Easy Oatmeal Carrot Cake effortlessly:

1. Preheat the Oven: Preheat your oven to 350°F (175°C) and grease a 9-inch round cake pan.
2. Prepare the Oats: In a large bowl, combine the rolled oats with 1 cup of boiling water and let sit for 15 minutes.
3. Mix Dry Ingredients: In a separate bowl, whisk together the flour, baking powder, baking soda, cinnamon, nutmeg, and salt.
4. Combine Sugars and Oil: In another bowl, mix the brown sugar, granulated sugar, and vegetable oil until well combined.
5. Add Eggs and Vanilla: Beat in the eggs one at a time, followed by the vanilla extract. Continue mixing until smooth.
6. Combine Mixtures: Stir the soaked oats into the wet mixture. Gradually add the dry ingredients, mixing until just combined.
7. Incorporate Carrots: Gently fold in the grated carrots, and if desired, add the chopped walnuts and raisins.
8. Pour Batter: Transfer the batter to the prepared cake pan, smoothing the top.
9. Bake: Place the pan in the oven and bake for 30-35 minutes or until a toothpick inserted in the center comes out clean.
10. Cool: Once baked, remove the cake from the oven. Allow it to cool in the pan for 10-15 minutes before transferring it to a wire rack to cool completely.

These steps will help guide you to create an incredible Easy Oatmeal Carrot Cake that is sure to impress.