In a large jar or bowl, add rolled oats, your choice of milk, one ripe mashed banana, a sprinkle of cinnamon, honey if desired, and a small pinch of salt. Stir vigorously until combined.

Assess the texture of the mixture. Add more milk if it appears too dry, ensuring all oats are submerged.

Cover the jar or bowl tightly and refrigerate for at least 6 hours or overnight.

On the following morning, stir to recombine the ingredients and add a splash of milk if too thick.

Slice an additional banana and sprinkle it on top for freshness; dust with extra cinnamon if desired.