INGREDIENTS
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2 tablespoons vegetable oil
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1 pound ground beef chuck
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1 large white onion, minced
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Kosher salt
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1 to 1½ teaspoons chipotle chile powder
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1 10-ounce can Mexican-style diced tomatoes with green chiles
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1 15-ounce can pinto beans, drained
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1 medium zucchini or yellow squash, diced
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2 cups coleslaw mix or shredded cabbage
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Juice of 1 lime, plus lime wedges for serving
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Freshly ground pepper
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8 tostadas (flat crisp tortillas) or taco shells
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1½ cups shredded cheddar cheese (about 4 ounces)