In a large skillet, heat ½ cup olive oil over medium high heat and sauté prosciutto quickly until crisp. Add garlic, mushrooms, peppers and onions, and sauté until soft, approximately 10 minutes; remove from pan and set aside.
In same skillet, heat additional ½ cup olive oil, add potatoes and cook until golden brown, remove from skillet and set aside with the mushrooms, peppers, and onions.
Add chicken and sausage to skillet and sauté over high heat until brown on all sides. Discard excess oil, deglaze with white wine, add the rosemary, vegetables and potatoes. Simmer over low heat for about 10 minutes or until the chicken is done. Place on a platter, garnish with fresh parsley and serve immediately.
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