Prep the blender: Add frozen bananas and frozen berries to a high-speed blender or food processor. Sprinkle in chia or flax.
Add creamy elements: Spoon in Greek yogurt and protein powder if using.
Pour in small amounts of liquid: Start with 1/3 cup milk. You can always add more to reach a thick, scoopable texture.
Blend low and pulse: Use a tamper if you have one. Pulse, scrape down the sides, and blend until smooth and thick. Add milk a tablespoon at a time only if needed.
Taste and sweeten: Blend in honey or maple and a splash of vanilla if you want extra sweetness or aroma.
Bowl it up: Spoon the smoothie into a wide bowl and smooth the top with the back of a spoon.
Add toppings: Arrange fresh fruit, granola, nuts, seeds, and a drizzle of nut butter. Finish with coconut flakes or cacao nibs for crunch.
Serve immediately: Enjoy right away for the best texture and color.
Too thick? Add 1 tablespoon milk at a time and blend briefly.
Too thin? Add more frozen fruit or a handful of ice; blend quickly to avoid melting.
Not sweet enough? Add half a ripe banana or a teaspoon of honey.
