2 boneless chicken breasts
2 cups lightly packed baby spinach leaves (about 2 ounces)
1/4 cup pine nuts, toasted
2 tablespoons fresh lemon juice
1 to 2 teaspoons grated lemon peel
1/3 cup plus 2 teaspoons olive oil
Salt and freshly ground black pepper
1/3 cup freshly grated Parmesan