1. Bring the water to a boil and add the salt, brown sugar, and oats. Stir until incorporated and let simmer for 2 minutes.
2. Turn off heat and add the vanilla. Stir and let sit for 5 minutes.
3. Lightly grease the muffin tin or use silicone liners for easy removal after the oats are frozen.
4. Equally divide the oats between the muffin tins, then evenly distribute the nuts and blueberries.
5. Drizzle each cup with maple syrup, then sprinkle with the cinnamon. Place in the freezer to set.
6. To heat, remove an oatmeal cup from the freezer and place in a microwave-safe bowl. Heat on high for 3 to 5 minutes.

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