Add the oats, milk, salt, grated carrot, raisins, cinnamon, and brown sugar in a medium saucepan over medium-high heat. Bring the mixture to a simmer, stirring occasionally, and once it simmers, reduce the heat to the lowest setting.
Cook the oatmeal for 5 minutes, stirring from time to time, until the desired consistency is reached. Add the vanilla, stir, and turn off the heat. For a thicker oatmeal texture, cover and let the oats sit in the saucepan for 3 more minutes.
Serve:
Divide the oatmeal into bowls and top it with chopped walnuts or pecans.
Notes
You can use water instead of milk, but oatmeal won’t be as creamy.