Preheat the oven to 350F. Line two baking sheets with parchment paper and set aside.
Add the softened butter, brown sugar, and white sugar to a large bowl. Use a stand mixer or hand mixer to mix until well combined, about 3-4 minutes.
Add the egg, egg yolk, and vanilla extract. Mix until well combined, about 1-2 minutes.
Add the flour, baking soda, and salt. Mix until the flour is just combined. The dough will be quite sticky.
Use your hands or a knife to crush the potato chips, oreos, and pretzels into smaller pieces. Add them to the dough. Add the m&m's and sprinkles. Mix on low until the mix-ins are just combined.
Use a large cookie scoop to scoop out the dough. Place up to 5 dough balls on each cookie sheet, evenly spaced apart.
Transfer to the oven and bake for 8-10 minutes, until the edges are just starting to brown and the center looks set. Remove from the oven and let the cookies cool on the baking sheets for 10 minutes, then transfer to a cooling rack to cool completely. Enjoy!