Put all of the ingredients in a large 90-ounce capacity blender jar. Make in batches when using a smaller blender.
Add the cover and blend until smooth.
Pour into glasses, garnish with orange slices, and serve immediately.
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Notes
One: Make Ahead
You can make this up to two hours ahead of time. Place the covered blender jar or a pitcher with a lid in the freezer. Shake the orange julius every 20-30 minutes to keep it from freezing solid. Stir or shake well before serving.
Two: Storage
Store leftovers in the fridge for 2-3 days. Stir before serving. Or pour leftovers into an ice cube tray or popsicle mold and freeze for later.
Three: Pineapple
Use a 12-ounce container of pineapple juice (or pineapple orange) concentrate and garnish with pineapple slices.
Four: Ice Cream
Add two cups of vanilla ice cream instead of half-n-half. Or serve it over scoops of vanilla ice cream in glasses like an orange float.
Five: Smoothie
Use one cup of vanilla yogurt instead of half-n-half. Add one sliced banana and a scoop of vanilla protein powder if desired.Recipe adapted from Bounteous Blessings by Frances A. Gillette