Combine ultrafine pure cane sugar, powdered sugar, baking soda, and desired flavor mix-ins. The mixture should be dry, resembling flour. If it is too wet, the mixture will not mold properly.
Press the mixture into round measuring spoons. Press the two spoons together and shake them gently in the palm of your hand to form the mixture into a sphere.
Remove the spoons one at a time; they should release easily as long as the mixture isn't too wet. Set the ball on a rimmed tray. Let dry at room temperature for 4 hours.
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