Add 1 cup milk + RNWY protein powder to Ninja Creami container. Tightly close the lid. Shake until protein powder is mixed well.
Open container. Break banana into 3-4 pieces and place in the protein powder liquid. Add frozen berries and pineapple. Make sure mixture is fairly even across the top. Push down any fruit that is sticking up above the fill line.
Tightly close container. Place in the freezer for 24 hours or until frozen solid.
When you're ready to make your smoothie bowl, remove container from freezer. Rinse the outside with warm water for a few seconds.
Attach the container to your Ninja Creami. Secure in place and choose 'Lite Ice Cream' setting. Allow to process.
Remove the lid. Add ¼ cup milk of choice. Choose 'Re-Spin' and allow to process.
Pour into a bowl. Add toppings to your smoothie bowl and enjoy!