Pour 2 tablespoons of oil into the bottom of a large pan over medium-high heat. Place 3 test popcorn kernels into the pan and cover with a lid. After the test kernels pop, add 1/2 cup of popcorn kernels to the pan and cover with lid. Take the pan off heat when the sound of kernels popping slows down. Once you have the popcorn made, salt it liberally.
Melt 1/4 cup of butter in a medium sauce pan. Once the butter is melted add 3 cups of mini marshmallows. Stir until the marshmallows are melted. Turn off the heat. Add 1 tsp. of vanilla. Do not overcook.
Spread your popcorn out on a prepared cookie sheet. Make sure you remove all of the un-popped kernels. Pour the marshmallow mixture over the popcorn and then gently fold the popcorn with a spoon until most of the kernels are covered in mixture.
Once the popcorn is covered in marshmallow mixture, add the candy, but don’t wait too long, or the candy won't stick. Sprinkle the candy onto the popcorn. Allow the popcorn to cool. Break apart into pieces and devour.