In a large bowl, combine the popcorn and any mix-in's. Set aside.
In a large pot, combine marshmallows, margarine or coconut oil, and salt.
Cook marshmallow stirring very often over medium-low heat until melted.
Pour hot marshmallow mixture over popcorn mixture, and mix well.
When cool enough to handle, oil hands and shape mixture into balls. When shaped, decorate with sprinkles and place in a lightly oiled muffin tin to hold shape.
To store, wrap each popcorn ball in plastic when cooled.