Most forms of light do, in fact, produce heat in addition to light. However, devices such as flashlights are made to distribute this heat in a way which makes them safe for a user to touch. Unfortunately, oatmeal is perishable once the oats are mixed with water. While a light could theoretically eventually cook oatmeal, it would be unlikely to do so before the oatmeal ceased to be suitable for consumption.
In other words, it would be slower than average oatmeal.
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In other words, it would be slower than average oatmeal.