Bring the milk to a boil in a small saucepan. Add the quinoa and return to a boil. Reduce heat to low and simmer covered until 3/4 of the milk has been absorbed, about 15 minutes.
Stir in the sugar and cinnamon. Cover again and cook until almost all the milk has absorbed, about 8 minutes.
Serve in bowls, and top with fruits of your choice.