To make Spanish chicken and chorizo paella, you will first need to prepare the ingredients. In a large saucepan, heat the olive oil over medium-high heat. Add the chicken, and cook, stirring frequently, until it is no longer pink in the center, about 20 minutes. Remove the pan from the heat and add the onion and garlic. Cook until the onions are translucent, 3 to 4 minutes, or until they are softened. Pour the stock into the saucepan and bring it to the boil, then simmer for 5 to 10 minutes until all the liquid has been absorbed. Stir occasionally. Serve the Spanish Chicken and Chorizo Paella with sour cream, guacamole, jalapeos and cilantro.