1. Place the oats and water in a microwave-safe cereal bowl that has a capacity of at least 2 cups. Microwave, uncovered, on high, until the oatmeal is thick and almost all of the water is absorbed, about 1 1/2 to 2 1/2 minutes. If oatmeal is still watery after 1 1/2 minutes, continue microwaving in 30 second increments. Remove the bowl from the microwave, and stir in the cinnamon. Let the oatmeal stand until all of the water is absorbed, about 30 seconds to 1 minute.
2. Sprinkle the brown sugar, raisins and walnuts, if using, evenly over the oatmeal. Stir in or leave on top as desired. Serve at once.
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