Bacon Wrapped Chicken with Blue Cheese and Pecans

Name: Bacon Wrapped Chicken with Blue Cheese and Pecans
Ingredients: 4 pieces boneless, skinless chicken breast; Salt and freshly ground black pepper; 1 cup blue cheese crumbles; 1/4 cup toasted pecans, chopped; 2 scallions, sliced on bias; 4 slices good-quality center cut bacon; 1 tablespoon extra-virgin olive oil; 2 tablespoons butter; 2 tablespoons all-purpose flour; 1 cup chicken stock; 1/2 cup half-and-half or cream; 2 tablespoons grainy mustard; Special equipment: toothpicks