In a heavy-bottomed saucepan, combine water, 1-1/2 cups milk, vanilla extract or paste, rinsed quinoa, and salt. Bring to a boil over medium-high heat (stirring occasionally and watching carefully so it doesn't boil over).
Reduce heat to low, cover with lid slightly vented, and simmer for 15 minutes, stirring occasionally.
Stir in 3 tablespoons brown sugar and the ground cinnamon. Re-cover and continue to simmer for about 5 minutes, until almost all of the liquid has been absorbed.
Remove from heat and gently fold in blueberries. Serve, topped with extra brown sugar, warm milk, and nuts.