Place the oats in a medium bowl and add very hot water, just enough to cover the oats. Allow to sit for 5-10 minutes. The oats will absorb most of the water.
To the bowl of oats add the cinnamon, nutmeg, salt, milk, maple syrup, bananas and blueberries (flaxseed if you are adding it). I like to hold back a few blueberries and banana slices and place on top. Sprinkle the walnuts over the top.
Lightly butter the bottom of a small baking dish (about 7 inches square) and put the oat mixture into the baking dish, smoothing the top and distributing the ingredients evenly. Add the remaining blueberries and bananas on top.
Bake for approximately 20-25 minutes until the edges are bubbling.
Recipe by FEASTS AND FOTOS at https://www.feastsandfotos.com/2014/01/20/baked-oatmeal/