Add 1 cup frosting to a mixing bowl.
Gradually mix in 2 to 2 ½ cups powdered sugar about ½ cup at a time until the dough is smooth and pliable.
Knead the dough by hand, adding powdered sugar as needed until it feels like soft, fluffy play dough.
If making different colors, divide the dough into small balls and add a few drops of food coloring to each. Knead the color in until it’s evenly distributed.
Play time!