Have a whisk ready nearby. Place the marshmallows in a heat-resistant bowl and microwave for 1 - 1 1/2 minutes.
When the marshmallows begin to ooze and swell, remove from the microwave and quickly stir with the whisk.
Quickly add the yogurt and mix together. Pour into any container and chill in the refrigerator.
Story Behind this Recipe
The recipe on the bottom of the marshmallow bag didn't use the microwave, and when the next day came, you could clearly tell that it was made from yogurt + marshmallow. This time, I took the picture when I removed them from the microwave and I wasn't able to work very quickly so there's a bit of a marshmallowy taste left over, but it still tastes good.
Shortcut Memo: I used the same bowl for melting the marshmallows, mixing in the yogurt, and cooling. The only dishes to wash are the whisk and the spatula used for scraping out the yogurt.