Prep the fruit: Break the banana into large chunks (leave a few thin slices if you want to garnish on top). Using frozen berries makes the base thick and spoonable without needing ice — it creates that dense, creamy texture like a frozen custard. If your berries are clumped together, give them a quick shake in the bag so they feed into the blender evenly.

Toast the sunflower seeds and oats: Heat a small dry skillet over medium heat. Add the 2 tbsp sunflower seeds and 1 tbsp oat flakes and toast, stirring constantly, for 2–3 minutes until fragrant and just turning golden. Toasting blooms the natural oils in the seeds and intensifies their nutty aroma and crunch — don’t walk away or they will burn quickly.

Reserve a small pinch of the toasted sunflower seeds and oats for finishing. The contrast between the warm toasted topping and the cold smoothie is a restaurant trick that adds interest and texture when served.

Build the smoothie base: Into a blender add the frozen berries, the banana chunks (reserve the slices for garnish), 1 cup plain yogurt, 1/2 tsp vanilla extract and a pinch of salt. The yogurt provides body, protein and a slightly tangy counterpoint to the sweet berries; the salt and vanilla amplify the flavors.

Pulse first, then blend: Start with 3–4 short pulses to break up the frozen fruit so the blades don’t struggle. Once the fruit is broken down, blend on medium-high in 10–15 second bursts, stopping to scrape the sides as needed. This prevents overheating the berries (which preserves color and bright flavor) and helps you control thickness.

Check texture and adjust: You want a thick, spoonable consistency — not a pourable smoothie. If it’s too thick, add a tablespoon of cold water or additional yogurt and pulse again. If it gets too thin, add a few more frozen berries or a couple of ice cubes and re-blend briefly. Keeping it thick ensures it holds toppings and looks restaurant-polished.

Transfer to a bowl: Spoon the smoothie into a shallow bowl so you have a wide surface for arranging toppings. Use the back of the spoon to create a small swirl or shallow well in the center — it helps the garnish sit prettily and gives the bowl a professional finish.

Top and finish: Artfully scatter the reserved toasted sunflower seeds and oats over one side, add banana slices or extra berries on another, and tuck in a few mint leaves if using. The goal is contrast — creamy base, crisp seeds, and fresh fruit — so place toppings in sections rather than mixing them all together.

Serve immediately: Smoothie bowls begin to melt as soon as they’re out of the blender. Serve right away so the texture is dense and cold like soft-serve.

Make-ahead tip: If you need to prep, toast the seeds and oats and keep them in an airtight container at room temperature. You can also pre-slice and flash-freeze banana slices on a tray for even thicker, creamier results when blended.