Chop the nuts and toast them in a pan until fragrant. Mash half of the banana with a fork and slice the other half.
Put oats in a pot, add milk and stevia as well as the pinch of salt, vanilla, and cocoa powder. Stir everything together and bring to a simmer on medium heat.
Turn down the heat and let the oatmeal thicken for about 10 to 15 minutes, stirring often.
The riper the banana, the less stevia you will need!