Prepare popcorn according to package directions. Remove all unpopped kernels. Place popcorn in large bowl sprayed with cooking spray.
Place marshmallows and Fleischmann’s in 8-cup glass measure or large microwave-safe glass bowl. Microwave on HIGH 1-1/2 to 2 minutes or until marshmallows are melted and smooth when stirred. Add powdered gelatin, stirring constantly until well blended
Pour mixture over popped corn. Add gumdrops and gently toss to evenly coat.
Spray hands with cooking spray, quickly roll into 1-1/2-inch balls. Allow to set about 1/2 hour before enjoying. Store in airtight container.