01 - Combine oats and milk in a medium saucepan. Bring to a gentle simmer over medium heat, stirring occasionally to prevent sticking.
02 - Stir in raisins, cinnamon, nutmeg, and a pinch of salt. Cook for 5-7 minutes, stirring frequently, until oats are creamy and tender.
03 - Add maple syrup and vanilla extract. Cook for 1 additional minute, stirring constantly to incorporate flavors evenly.
04 - Remove from heat. Divide oatmeal between serving bowls. Top each portion with butter (if using), chopped nuts, and an extra drizzle of maple syrup. Serve immediately while warm.