1. Heat the olive oil in a large skillet over medium heat. Reduce heat to medium low and add the onion and salt; cook, stirring occasionally, until onion is golden brown, about 8 minutes. Mix in the garlic and cook 30 seconds. Add the tomato paste and saffron and cook, stirring, 2 minutes. Add the white wine, mushrooms, artichoke hearts, shrimp, scallops and sausage; stir. Mix in the rice and chicken broth; cover and cook until liquid has dissolved, approximately 10 minutes.
2. Top paella with the smoked paprika and parsley and serve.