Get Everything Ready: Measure the pineapple juice, Dream Whip, half and half, and powdered sugar. Make sure all ingredients are cold or at room temperature. Do not use ice, frozen fruit, or hot ingredients.
Mix the Pineapple Base: Pour the pineapple juice into a large bowl or pitcher. Add the Dream Whip, half and half, and powdered sugar. Stir well until completely smooth and the dry ingredients are fully dissolved.
Prepare the Ninja SLUSHi: Make sure the auger is installed correctly and the vessel is locked in place. Attach the drip tray, plug in the machine, and open the top cover.
Add and Freeze: Pour the pineapple mixture into the machine. Close the lid and select the SLUSH or MILKSHAKE preset. Do not add ice or frozen fruit.
Serve: Let the Ninja SLUSHi run for about 15–60 minutes, depending on the starting temperature and amount of liquid. Once the mixture reaches a thick, creamy slush texture, place a cup under the dispenser and slowly pull the handle to serve.