Vegetarian Quinoa-Stuffed Peppers

Preheat oven to 375 degrees F. Cut off stem end of each bell pepper. Chop the pepper tops to yield 1 cup. Remove and discard seeds and membranes from peppers. Bring about 1 inch of water to a boil in a large saucepan fitted with a steamer basket. Add the peppers; cover and steam until starting to soften, about 3 minutes. Remove the peppers and set aside.

Heat oil in a large skillet over medium heat. Add onion and the chopped pepper tops; cook, stirring occasionally, until the onion is translucent, about 5 minutes. Stir in garlic, cumin, chili powder, chipotles and adobo; cook, stirring constantly, until fragrant, about 1 minute. Remove from heat and add quinoa, black beans, tomatoes, corn and salt; fold until well combined.

Stand the peppers upright in an 11-by-7-inch baking dish. (Trim the bottoms, if necessary, to keep the peppers upright.) Spoon about 1 cup quinoa mixture into each pepper, packing it in tightly. Cover the stuffed peppers with foil.

Bake the peppers until warmed through, about 10 minutes. Remove the foil and sprinkle the peppers evenly with cheese. Bake, uncovered, until the cheese melts and browns slightly, 5 to 8 minutes. Let rest for 5 minutes before serving.