Gather all ingredients. This will make the cooking process smoother.
In a medium saucepan, combine the rolled oats, almond milk, and a tiny pinch of sea salt. Bring to a gentle boil.
Reduce heat to low and stir in the ground cinnamon and mashed banana. Cook for about 10-15 minutes, stirring occasionally, until the oats are soft and have absorbed most of the liquid.
Remove from heat and let the oatmeal sit for 2 minutes to thicken.
Serve the oatmeal in bowls, topped with walnuts or pecans, a bit of almond butter and shredded coconut if desired.