Preheat oven to 350°F. Using a small paring knife, cut around the tops of the peppers at a slight downward angle. Remove the tops, flip peppers upside down, and tap out the seeds. Pull out any veins. If the bottoms aren’t level, slice a tiny bit off so they sit flat. Place peppers in a baking dish where they fit close together. This helps them stay upright and steam as they bake.
Heat olive oil in a large skillet over high heat. Add onion and garlic, cooking and stirring until lightly golden, about 3 minutes. Push to the edges of the skillet and add beef to the center. Let sear about 1 minute per side before breaking it up. Cook and crumble until browned through. Stir in chili powder, cumin, paprika, onion powder, garlic powder, oregano, salt, pepper, and tomato paste. Cook, stirring constantly, until fragrant, about 2 minutes.
Add rice, black beans, corn, and chicken broth. Stir and bring to a simmer. Cover, reduce heat to medium-low, and cook 13–15 minutes, until rice is just tender. The filling should stay slightly saucy, not dry or heavy (add an extra splash of broth if needed). Stir in cilantro and taste for seasoning.
Spoon half of the filling into the peppers. Top with half of the cheese, then finish filling with the remaining mixture. Place pepper lids back on. Pour 1/2 cup water into the bottom of the pan. Cover pan tightly with foil and bake for 45 minutes. Remove foil and pepper lids. Top with remaining cheese and bake 5–8 minutes more, until the cheese is melted.
Serve hot with your favorite toppings: lime, diced avocado, and sour cream are my faves!
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Notes
Note 1: I like using red, orange, or yellow peppers. Choose large, evenly sized ones with four bumps on the bottom so they stand upright and cook evenly. Depending on the size, this filling usually fills 5–6 peppers.Note 2: Basmati rice works especially well in this dish. Long-grain white rice is the next best option, but I don’t recommend other varieties.Storage: Store cooked peppers in an airtight container in the fridge for up to 4 days. For longer storage, wrap and freeze for up to 3 months. Reheat in the oven until warmed through.