Begin by juicing the fresh oranges to obtain about one cup of fresh orange juice. Strain the juice to remove any pulp if desired.
In a blender, combine the fresh orange juice, milk, water, sugar, vanilla extract, and powdered orange zest (if using).
Blend the mixture until well combined, ensuring the sugar is fully dissolved.
Gradually add the ice cubes to the blender while blending until the mixture becomes smooth and frothy. Adjust the amount of ice based on your preferred consistency (more ice for a thicker drink).
Taste the Orange Julius and adjust the sweetness by adding more sugar if necessary. Blend again briefly if you do.
Pour the dreamy creamsicle mixture into tall glasses.
Notes
Garnish with a slice of fresh orange or a sprig of mint for a refreshing touch.