INGREDIENTS
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1 pound ground beef
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1 onion, one-half finely chopped, one-half thinly sliced
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1 cup corn chips, such as Fritos, crushed
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1 large egg, lightly beaten
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1 tablespoon chili powder
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Salt and pepper
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1 tablespoon extra-virgin olive oil
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1 28 ounce can chopped tomatoes
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1 15 ounce can black beans
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6 sandwich rolls, split halfway and toasted
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2 cups shredded pepper jack cheese (about 8 ounces)