Combine oats, barley, and water in a medium microwave-safe bowl. Cover and refrigerate overnight. (Oats will expand as they soak up water so be sure the bowl is big enough.)
Uncover bowl and stir in salt. Microwave uncovered on HIGH for 3 minutes. Stir well and microwave 3 more minutes. Stir again and cook for 2 minutes. Most of the liquid should be absorbed at this time.
You can toast your almonds in a pan on the stove for a few minutes at this time and then let them cool on a paper towel.
When oats are done, stir in vanilla extract, cinnamon, nutmeg, and almond milk.
Divide mixture into 4 bowls, drizzle with maple syrup, and sprinkle with almonds and blueberries.