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Soak the tomatillos in warm water for about 5 minutes to loosen the husks, then remove the husks, clean the skins and quarter-cut.
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Heat a large skillet with oil to medium-high, and add the onions, garlic, salt/pepper, and peppers, cook for two minutes then add the tomatillos; cook for 5 more minutes.
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Add the cilantro, broth, and oregano, bring to a high simmer.
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Once the tomatillos have softened, using a stick or immersion blender, puree until mostly smooth, you can use a regular blender or a food processor.
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Bring to a high simmer add the meatballs...