Preheat an oven to 350°F. Place oats and pecan halves on a rimmed baking sheet, and bake in the oven, stirring occasionally, until toasted and fragrant (12 - 15 minutes). Let cool completely.
Add toasted oats and pecans to a blender, and blend until finely ground. Add milk, yogurt, frozen bananas, maple syrup, cinnamon, vanilla and a pinch of salt, then blend until smooth. Divide between 2 glasses and top with grated nutmeg and crumbled pecans if using. Enjoy immediately.
Notes
* You can use lighter milk and yogurt if desired here.