| 4 skinless, boneless chicken breast halves, cut into bite size pieces 6 cloves garlic, minced 2 1/2 cups fresh sliced mushrooms 1 tablespoon olive oil salt to taste ground black pepper to taste | 2 cups half-and-half 6 ounces Gorgonzola cheese, crumbled 1/4 cup toasted walnuts, chopped 8 ounces penne pasta 1/4 cup grated Parmesan cheese for topping (optional) |