Load the blender. Add raspberries, banana, yogurt, 1/2 cup of your liquid, and vanilla if using.
If your fruit is fresh, toss in a few ice cubes.
Blend until smooth. Start on low, then increase to high for 30–45 seconds. Stop and scrape the sides if needed.
Taste and tweak. If it’s too thick, add more liquid a splash at a time. If it’s more tart than you like, add honey or maple syrup.
A tiny pinch of salt can brighten the flavor.
Blend again briefly. Give it 5–10 seconds to incorporate any adjustments.
Serve right away. Pour into a chilled glass for the best texture and flavor. Add a few raspberries on top if you want a pretty finish.