Defrost the dragonfruit. This applies if you are using a dragonfruit puree smoothie pack (if using cubes, skip this step). Run the smoothie pack under cool water to help break it up so it is easy to put in the blender.
Add ingredients to a high-powered blender. In the following order, add the milk, any add-ins (if using), dragonfruit puree, watermelon, and strawberries to the blender.
Blend until smooth. Start the blender on a low setting and slowly work up to about ⅓ speed. Use the tamper to push the frozen fruit down into the blade. Continue until the smoothie bowl ingredients are completely smooth.
Spoon into bowls and top as desired. Enjoy immediately!
Notes
Pitaya Foods sells dragonfruit cubes or dragonfruit smoothie packs.