Let the frozen acai packets sit at room temperature for a few minutes, just until they soften slightly. Remove them from the packaging and break or cut them into smaller pieces to make blending easier.
Add the acai pieces, frozen banana chunks, mixed berries, and peanut butter into a blender.
Place the lid on the blender and start blending on low speed. Gradually increase the speed as the ingredients begin to combine. Since everything is frozen, the mixture will be thick. If needed, add non-dairy milk one tablespoon at a time to help the blending process and reach a smooth, creamy texture.
Once the mixture is fully blended and smooth, transfer it into a bowl. Add your favorite toppings such as granola, sliced banana, fresh fruit, or an extra drizzle of nut butter.