INGREDIENTS
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3/4 pound flank steak, trimmed
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1 tablespoon minced garlic
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2 tablespoons dry sherry
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1 teaspoon cornstarch
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1 teaspoon reduced-sodium soy sauce
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1/4 teaspoon black pepper
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2 tablespoons plus 1 teaspoon peanut or vegetable oil
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2 cups sliced bell peppers
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1 cup thinly sliced onion
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1 teaspoon lime juice
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2 teaspoons chili powder
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1/2 teaspoon salt
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1/4 cup chopped cilantro
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8 6 inches flour tortillas
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1/4 cup plain nonfat Greek yogurt or reduced-fat sour cream (optional)