If you are making your own popcorn, then you will want to pop the kernels. Put about 1/3 cup of unpopped kernels into a brown paper bag and fold over the top twice. Microwave for about 2 to 4 minutes, stopping when you hear a few seconds between pops. Then, remove the bag from the oven. Do two batches of this to end up with a total of about 8 cups of popcorn. * It is important to sift out the unpopped kernels after cooking, you don't want those in your popcorn balls!
Preheat a large pot over medium heat, once hot, add the butter to melt. Once melted, add the marshmallows and stir with a wooden spoon until the marshmallows melt. Then add in the chopped pretzels and stir. You are going to want to work quickly and add the popcorn and chocolate chips next, folding the popcorn into the marshmallows until everything is combined. The chocolate will melt and cover the whole mixture.
Once all ingredients are well combined, let the mixture cool for a couple of minutes to be able to use your hands. Then, take a handful of the mixture and use your hands to roll it into a 2-3 inch ball. Continue with the rest of the mixture, and enjoy!
Notes
**Make sure you sift out the kernels that didn't pop in the microwave, you don't want to bite into those in your popcorn balls!