Spray a small slow cooker lightly with cooking spray.
Mix oats, 1/2 cup brown sugar, cinnamon, and nutmeg together in a large bowl. Stir in pumpkin. Stir in water and half-and-half gradually. Stir in raisins and vanilla extract.
Ladle oat mixture into the slow cooker. Cook on Low until oats are soft and creamy, 7 1/2 to 8 1/2 hours.
Sprinkle 2 tablespoons plus 2 teaspoons brown sugar and 5 tablespoons plus 1 teaspoon walnuts over oatmeal.
Refrigerate any leftover oatmeal. Put the desired amount into a microwave-safe bowl, cover, and reheat on 100 power (high), adding a bit of milk as necessary to reach the desired consistency.
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