Gather your rolled oats, water or milk, brown sugar, and all the spices.
In a medium saucepan, combine the rolled oats with your choice of water or milk. Add the brown sugar and stir to ensure the oats are well-coated.
Sprinkle in the ground ginger, cinnamon, nutmeg, cloves, and salt. Stir the mixture well to combine all the flavors.
Bring the mixture to a boil over medium heat. Once it starts bubbling, reduce the heat to low and let it simmer for 5-7 minutes. Stir occasionally to prevent sticking. Add the molasses and any optional raisins or nuts, and cook for an additional minute.
Remove from heat and let it sit for a minute to thicken. Serve in bowls, drizzle with maple syrup or honey, and add a splash of milk or non-dairy milk on top.