Prep your fruit: Slice ripe bananas and freeze them on a parchment-lined tray until solid. Keep a bag of frozen mixed berries on hand.
Chill your bowl: Pop a serving bowl in the freezer for 5 minutes.
A cold bowl helps keep the smoothie thick and spoonable.
Add to blender: Place frozen banana slices and frozen berries into a high-speed blender. Add milk, yogurt, nut butter, seeds (if using), vanilla, spice, and salt.
Pulse, then blend: Start on low, using short pulses to break up the frozen fruit. Gradually increase speed, scraping down sides as needed.
Use the tamper to keep things moving.
Adjust texture: If too thick to blend, add milk 1 tablespoon at a time until the blades catch. Aim for a thick, soft-serve consistency that holds peaks.
Taste and tweak: For more sweetness, add a small date, a teaspoon of honey, or a splash more vanilla. For tang, add an extra spoon of yogurt.
Serve fast: Spoon into the chilled bowl.
Smooth the top with the back of a spoon to create swoops and valleys for toppings.
Add toppings: Layer on fresh berries, granola for crunch, seeds for protein, and a sprinkle of coconut or cacao nibs for texture.
Enjoy immediately: This is best eaten right away while it’s cold and thick.