INGREDIENTS
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4 teaspoons olive oil, divided
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1/2 teaspoon salt, divided
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1 1/4 pounds chicken breast tenders
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1/2 cup balsamic vinegar, divided
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2 cups red bell pepper strips (about 2 medium)
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2 cups vertically sliced onion (about 1 large)
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2 (8-ounce) loaves focaccia bread, cut in half horizontally
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4 ounces provolone cheese, thinly sliced
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1/8 teaspoon black pepper