In a cast iron, cook chorizo breaking it up into pieces. Once cooked, place on a plate with a paper towel to drain some of the grease.
In the same pan, add olive oil and cook onion. Stir frequently so it doesn't burn.
If you don't like sour cream, you can use more cream cheese or use greek yogurt. If you don't have a cast iron pan, you can use another oven safe pan or you can cook all the ingredients, mix together and then put in an oven safe dish for baking.