Spray 13x9-inch baking pan and large bowl with cooking spray.
Prepare popcorn according to package directions. Remove all unpopped kernels. Combine popped corn, cranberries, morsels and almonds in bowl.
Place marshmallows and butter in 8-cup glass measure. Microwave on HIGH 2 minutes or until smooth when stirred. Immediately pour over popcorn mixture; toss until coated evenly. Place in pan. Moisten hands with water; press mixture evenly into pan. Allow to cool. Cut into 24 bars.