Place your banana on a small baking sheet or dish coated with parchment paper.

Add the blueberries and strawberries to the same platter (store-bought frozen fruit will work just as well).

Place the pan or plate in the freezer and allow the fruit to totally freeze.

After the milk and yogurt are frozen, place them in the bowl of a large, high-speed blender fitted with a tamper (see notes).

Mix in the frozen blueberries, strawberries, banana, and acai.

Using the tamper, press the frozen fruit down into the blender, mixing as much as possible.

Continue to mix on low until smooth, adding more liquid just as required.

Split the smoothie between two bowls and top with your preferred toppings.

Sliced banana, almonds, seeds, granola, and berries are popular additions.

It's best to eat it right away.