Pour mixture slowly into 13 x 9 inch pan, lightly coated with cooking spray. Chill at least 3 hours. Jigglers will be firm after 1 hour, but may be difficult to remove from pan.
To cut Jigglers dip bottom of pan in warm water for 15 seconds to loosen gelatin. Cut shapes with cookie cutters all the way through the gelatin. Lift from the pan with index finger or metal spatula.