INGREDIENTS
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3 tablespoons vegetable oil, divided
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2 1/2 cups finely chopped onion, divided
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4 cloves garlic, minced and divided
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1 (28-ounce) can crushed tomatoes
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3/4 cup chicken broth
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2 tablespoons minced chipotle peppers in adobo
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2 teaspoons ground cumin
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1 teaspoon ground coriander
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1 teaspoon salt, divided
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1 1/2 pounds yellow squash, sliced into half-moons
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1 tablespoon all-purpose flour
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1 cup sour cream
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2 cups shredded Cheddar cheese, divided
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1 tablespoon chopped fresh cilantro
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16 corn tortillas
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Garnish: chopped tomato and sliced green onion