Prepare Your Ingredients. Measure out 1½ cups of frozen mixed berries and 1 ripe banana. If you prefer a thinner smoothie, slice the banana and freeze it beforehand.
Blend the Ingredients. In a blender, combine the mixed berries, banana, Greek yogurt, milk, vanilla extract, and honey (if using). Blend on high speed for 30-60 seconds until smooth and creamy.
Adjust Consistency. If the smoothie is too thick, add a splash of milk or water and blend again. For a thicker texture, add a handful of ice cubes and blend until smooth.
Serve and Enjoy. Pour the smoothie into a glass and serve immediately. Garnish with fresh berries or chia seeds for an extra boost of nutrients.