Turn your instant pot to sauté mode. Wait for it to get hot, and then add in your butter. Let your butter completely melt.
½ cup butter
Add in your unpopped kernels and salt. Stir well to coat your kernels with butter and salt.
½ cup popcorn kernels, pinch of salt
Place the lid on your instant pot to seal in the heat. Your popcorn kernels will start to pop. Allow them to continue to pop until you stop hearing popping for at least 20 seconds.
Once they have stopped popping for at least 20 seconds, press cancel on your instant pot and remove the lid.
Transfer your buttery popcorn to a large bowl. Be careful not to transfer any kernels with the popcorn.
In a small microwaveable bowl, melt your white chocolate wafers. Microwave in 30-second intervals, stirring with a spoon.
12 ounces white chocolate melting wafers
Once your chocolate has completely melted, evenly distribute and pour over your popcorn. Stir together making sure that each popcorn is covered in chocolate.
Quickly, before the white chocolate melts, make an even layer with the sticky popcorn mixture on a baking sheet covered in parchment paper. Immediately distribute the marshmallows, chocolate chips, and graham crackers on top of the popcorn. Mix together.
1/2 cup mini marshmallows, 1/2 cup mini milk chocolate chips, 1 oz graham crackers
Allow the popcorn mixture to fully cool on the counter at room temperature, or to speed up the process, in the refrigerator.
Serve and enjoy!