Get 2 small bowls and place 1 cup of yogurt into each bowl. Mix in pink food coloring into one bowl and blue in the other; stirring just enough to leave a bit of a swirl.
Prep baking pan by covering it with parchment paper and setting aside.
Place blue yogurt in a piping bag and the pink in another. Place the piping tip on the third bag. Carefully snip the ends off of both of the colored bags. Line them up side by side and carefully slide them into the third bag. When squeezed this will cause both colors to come out at once creating a swirl.
Squeeze the yogurt onto the parchment lined baking sheet into discs. Continue until you have used all of the yogurts. Sprinkle the yogurt with rainbow sprinkles and place the pan in the freezer for at least 1 hour or until discs are hard.
Serve immediately or remove from paper and place in an airtight container and return to freezer until ready to enjoy!