Prep your frozen fruit: Make sure your bananas and berries are completely frozen. If you're starting with fresh fruit, freeze them for at least 4 hours or overnight. This is crucial for getting that thick, ice cream-like consistency.
Blend the base: Add the frozen bananas, frozen berries, yogurt, milk, and vanilla extract to your blender. Start with less milk than you think you need – you can always add more, but you can't take it out!
Achieve the perfect texture: Blend on high speed, using your blender's tamper if you have one. Stop and scrape down the sides as needed. The mixture should be thick enough that it doesn't pour easily – think soft-serve ice cream texture.
Adjust consistency: If it's too thick to blend, add milk one tablespoon at a time. If it's too thin, add more frozen fruit or a handful of ice cubes.
Pour into your bowl: Transfer the smoothie mixture to a wide, shallow bowl. This gives you plenty of surface area for all those beautiful toppings.
Add your granola and toppings: Work quickly before the smoothie starts to melt. Sprinkle granola down the center or around the edges, then arrange your fresh fruit, seeds, and other toppings in sections or patterns.
Serve immediately: Grab a spoon and enjoy your creation right away while the base is still cold and thick!