Fill a piping bag or ziplock back with yogurt (your choice of flavor). Freeze for a few minutes to an hour, checking every 10 minutes. You want it to solidify a bit without becoming solid.
Meanwhile, rinse raspberries and allow to dry a bit. Once the yogurt is frozen, fill with piping bag or cut off the tip of your ziplock.
Gobble them up! Even top with poppy seeds for "sprinkles," if desired.