Heat a 10-12 inch oven-safe cast iron skillet over medium-high heat. Add the chorizo and cook for 5-7 minutes, breaking it into crumbles as it cooks, until fully browned.
Drain any excess grease, leaving the chorizo in the skillet. Reserve about ? cup of the cooked chorizo for topping.
Stir the chopped green chiles into the remaining chorizo until evenly combined.
Sprinkle the Monterey Jack cheese evenly over the chorizo mixture, then top with the mozzarella cheese.
Bake for 10-12 minutes, or until the cheese is melted, bubbly, and just beginning to brown around the edges. Be careful not to overbake.
Remove the skillet from the oven and immediately top with the reserved chorizo and the pico de gallo.
Serve warm with tortilla chips and enjoy!
Notes
Refrigerate leftovers in an airtight container for up to 1 week.
Freshly grated cheese melts much smoother than pre-shredded cheese.
You can substitute Pepper Jack cheese for some of the Monterey Jack if you'd like a spicier dip.
This dip is best served immediately while the cheese is hot and gooey.