Place the oats in a blender and pulse until they are finely ground, creating a smooth base for your smoothie.
Add the frozen banana chunks, almond milk, peanut butter, maple syrup, vanilla extract, cinnamon, and kosher salt to the blender with the ground oats.
Blend the mixture until it reaches a smooth and creamy consistency, pausing to scrape down the sides of the blender if necessary.
Taste the smoothie and add more maple syrup if you prefer a sweeter flavor. If you desire a thicker texture, add ice and blend again.