Wash the strawberries and blueberries thoroughly.
Hull the strawberries and slice them into halves or quarters.
Peel the banana and slice it into smaller pieces.
Add the strawberries, blueberries, and banana into the blender, ensuring all fruits are placed in the blender before the yogurt or liquids for a smoother blend.
Pour in the vanilla yogurt.
Add the milk of your choice to the blender.
Blend on high until smooth and creamy, scraping down the sides of the blender to ensure everything is fully combined.
Taste the smoothie and adjust sweetness by adding honey or agave syrup if needed.
If the smoothie is too thick, add more milk until you reach your desired consistency.
Pour the smoothie into glasses.
Garnish with extra fresh berries or a dollop of yogurt if desired.
Serve immediately, garnishing with additional fresh fruit or a dollop of yogurt for extra flavor and texture.