Step 1- In a medium sized sauce pan add your butter, once it foams add in your onions and all of your spices. Saute until the onions are browned, soft, and translucent. Set aside.
Step 2- In the same sauce pan add in your chorizo, brown on all sides and then add back in your onion mix. Once that's all cooked set aside the onion sausage mix.
Step 3- Continue in the same sauce pan, now add in your cheese and chiles, at a medium low heat allow the cheese to melt, be careful not to burn. Slowly as the cheese heats add in your condensed milk and stir slowly but constantly until the cheese and milk incorporate into one another so you have a smooth cheesy mixture. Add back the rest of your previously prepared contents and slowly stir the dip together until it bubbles. Enjoy with chips!
The key to this dish is to not burn the cheese, avoid the temptation to turn the heat way up. Keep it low and slow and the end result will be divine.