Begin by adding the butter and sugar to a large mixing bowl. Cream butter and sugar using a hand whisk or a stand mixer until it forms a creamy paste, approximately 3 minutes.
Add in eggs one at a time and mix to combine.
To the wet ingredients, add in flour and baking soda and mix a little at a time.
Add in the mini m&ms, chopped chocolate pretzels and mini M&Ms (chopped chocolate) and fold in with a spatula.
Using a large cookie scoop, scoop the dough and form balls. Place the balls on a baking sheet and let chill in the fridge for an hour.
Once the hour is done, preheat the oven to 350º and place a few cookies on a baking sheet lined with parchment paper.
Bake the cookies for 12 minutes or until lightly brown; rotating racks from top to bottom halfway through.
Let cool completely (approximately 30m) before serving to allow the cookies to fully set.