Combine cut fruit into a ninja creami container.
Add yogurt, syrup, and vanilla (if using). Stir everything together.
Add in milk until fruit is covered and you reach the max fill line. Stir everything and make sure fruit is still covered with liquid.
Freeze on a flat surface until frozen. Ninja Creami's suggested time is 24 hours.
When ready to eat, put the container into the outer bowl of the Ninja Creami, secure lid, and load into the NInja Creami Machine.
Process the creami using the 'smoothie bowl' option on the regular model. If you have a deluxe model use the 'lite ice cream' setting.
Check your smoothie bowl. If it is not a creami texture yet, respin the pint using the 'respin' option. Do this until it comes to the consistency you like. (Some people find it helpful to add a splash of milk after the first spin.)
Add your favorite toppings and enjoy!