In a small pot, bring the water to a simmer.
Stir in the oats, ginger, and red pepper flakes, if using.
Reduce heat to low, and simmer for 2 minutes, stirring occasionally.
Fold in the spinach and cook for another 1 minute, stirring occasionally.
Remove the pot from heat, then stir in the tamari, miso paste, and Gomasio until the miso dissolves. Taste and adjust the ingredients accordingly.
Spoon the oats into a bowl, then top with edamame.
Drizzle the toasted sesame oil on top and sprinkle on more Gomasio, as well as green onions, if you wish. Serve with tamari.