Preheat oven to 375ºF (190ºC). Melt butter in a skillet over medium heat. Add onion, garlic and cook until softened. Add spinach and parsley; cook, stirring for about 3 minutes or until moisture is absorbed; set aside to cool. In a bowl, mix spinach mixture with ricotta, mozzarella, parmesan, salt, pepper and egg yolk. Place chicken breasts on clean work surface, lift up the skin on each chicken breast and stuff 1/4 of the filling between the skin and the meat of each breast being careful not to tear the skin. Brush breasts with olive oil and place skin side up on a rack on a baking pan. Bake for 40 minutes until golden and chicken is cooked through. Serves 4
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