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Step 1
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Preheat oven to 400°. In a small saucepan, prepare rice according to package instructions.
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Step 2
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Meanwhile, in a large skillet over medium heat, heat oil. Cook onion, stirring occasionally, until softened, about 7 minutes. Stir in garlic and tomato paste and cook, stirring, until fragrant, about 1 minute more. Add ground beef and cook, breaking up meat with a wooden spoon, until no longer pink, about 6 minutes. Drain excess fat.
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Step 3
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Stir in rice and diced tomatoes; season with oregano, salt, and pepper. Let simmer, stirring occasionally, until liquid has reduced slightly, about 5 minutes.
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Step 4
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Arrange peppers cut side up in a 13″x9″ baking dish and drizzle with oil. Spoon beef mixture into each pepper. Top with cheese, then cover baking dish with foil.
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Step 5
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Bake peppers until tender, about 35 minutes. Uncover and continue to bake until cheese is bubbly, about 10 minutes more.
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Step 6
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Top with parsley before serving.
