"A semi-firm cheese that's nonetheless quite creamy, fontina melts into pure heaven. Combined with caramelized onions, fontina becomes a nutty, gooey, irresistible filling for chicken breasts...."
INGREDIENTS
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4 teaspoons extra-virgin olive oil , divided
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1 1/2 cups thinly sliced red onion
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2 teaspoons minced fresh rosemary , divided
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1/8 teaspoon salt
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Freshly ground pepper to taste
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2/3 cup shredded fontina cheese, preferably aged
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4 boneless, skinless chicken breasts (about 1 pound), trimmed of fat
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1/2 cup white wine
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1 cup reduced-sodium chicken broth
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4 teaspoons all-purpose flour