Prep the banana: If using a fresh banana, peel and break it into chunks. For a thicker, colder smoothie, use a frozen banana.
Add liquids first: Pour the milk into your blender. This helps the blades spin smoothly and prevents clumping.
Layer the rest: Add the banana, peanut butter, Greek yogurt (if using), oats, vanilla, and a small pinch of cinnamon or sea salt.
If you’re using ice, add it last.
Blend until smooth: Start on low and work up to high for about 30–45 seconds, or until creamy with no chunks.
Taste and adjust: If you want it sweeter, add a drizzle of honey or maple syrup. If it’s too thick, splash in a little more milk. Too thin?
Add a few ice cubes or more oats and blend again.
Serve right away: Pour into a chilled glass or a to-go cup. Sprinkle a dash of cinnamon on top if you like.