Prep. Preheat the oven to 425°F and grease a baking dish with non-stick cooking spray.
Prepare the peppers. Half the peppers lengthwise and remove the seeds and the fibrous insides. Place them in the baking dish, cut side up, and brush the insides with olive oil.
Bake. Bake the peppers uncovered for 10 minutes if you like them a bit crisp or for 20 minutes if you want softer peppers.
Brown the chorizo. While the bell peppers bake, make the filling. Heat the rest of the olive oil in a skillet over medium-high heat. Add the chorizo and cook until nicely browned, breaking it apart as you go.
Put it all together. In a large bowl, mix together the chorizo, rice, quinoa, corn, green chilis, tomatoes, 1 cup cheese, black beans, smoked paprika, garlic, and onion powder.
Assemble. Spoon the filling into the peppers and top with the remaining cheese.
Bake (again). Bake the stuffed pepper for 10 minutes or until the cheese has melted.
Make the flavored sour cream. While the peppers are baking, whisk together the sour cream and taco seasoning in a small bowl.
Serve. Serve the peppers warm with the flavored sour cream and chopped fresh cilantro.