INGREDIENTS
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1 (16.9-ounce) package frozen potato and Cheddar pierogies
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2 teaspoons vegetable oil, divided
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2 bell peppers (1 red, 1 green), sliced
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1 large onion, sliced
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1/2 teaspoon salt, divided
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1 pound boneless sirloin or flank steak, thinly sliced (see Note)
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1/4 teaspoon black pepper
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2 cups (8 ounces) shredded Cheddar cheese