1. Preheat broiler.
2. Cut bell peppers in half lengthwise. Remove and discard seeds and membranes. Place pepper halves, skin sides up, on a foil-lined baking sheet. Broil 15 minutes or until blackened. Place pepper halves in a zip-top plastic bag; seal. Let stand 15 minutes. Peel and chop peppers.
3. Heat a Dutch oven over medium-low heat. Add oil to pan; swirl to coat. Add onion; cook 15 minutes, stirring occasionally. Stir in cumin and next 4 ingredients (through garlic); cook 2 minutes, stirring frequently. Add bell peppers, broth, squash, and tomatoes; bring to a simmer. Cook 20 minutes, stirring occasionally. Add beans; simmer 25 minutes or until slightly thick, stirring occasionally. Sprinkle with green onions.
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