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1. Preheat oven to 350 degrees. Melt 1/4 cup butter; set aside.
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2. In a bowl, combine the remaining 1/2 cup butter with flour, using the back of a fork or a pastry blender to mix until creamy.
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3. Rinse chicken and pat dry. Cut each piece of chicken in half. Coat chicken with bread crumbs, pressing firmly. Drizzle coated chicken with melted butter; grill or broil for about 5 minutes per side or until fully cooked. Keep chicken warm while you make the sauce.
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4. In a large ovenproof skillet, bring stock to a boil; whisk in butter-flour mixture. Bring to a boil and cook, stirring, until mixture thickens. Reduce to a simmer. Add mushrooms, broccoli, prosciutto, garlic, red pepper flakes, lemon juice and wine. Simmer 5 minutes.
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5. Place cooked chicken pieces in sauce; sprinkle cheese on top of each chicken piece, dividing evenly. Place in oven and bake just until cheese melts, 3 to 4 minutes.
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6. Lift chicken onto plates; use a slotted spoon to ladle vegetables over cheese. Pour sauce over all; serve immediately.
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Note: If using fresh broccoli, cut florets and steam or microwave just until crisp-tender. If using frozen broccoli spears or florets, thaw and drain well.
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Tester's note: The sauce may be started about 30 minutes ahead. Prepare as directed, but do not add mushrooms and broccoli. Just before serving, add vegetables and simmer until hot, about 7 minutes.