Blend the Base:
In a blender, combine banana, blueberries, milk, yogurt, vanilla extract, sweetener (if using), and ice.
Blend on high speed until smooth and creamy.
If you like it extra thick, add a few more ice cubes or a handful of frozen fruit.
Whip & Layer (Optional):
For a whipped texture, pulse the blend for 10 extra seconds to aerate.
You can also swirl some extra yogurt into the glass before pouring for a marble effect.
Serve:
Pour into a tall glass or frappuccino-style cup.
Top with whipped cream and garnish with a few blueberries or banana slices.
Add a straw and enjoy immediately.