Prepare popcorn according to package directions. Remove all unpopped kernels. Place immediately into 1 gallon resealable bag.
Combine sweetener, cinnamon and nutmeg. Sprinkle over popped corn; seal bag and shake to evenly coat. Add 1 cup of any two items listed above; toss with popped corn.
Empty yogurt into serving bowl. Just before serving, stir in popcorn mixture.