Place the spinach in a large bowl, or divide evenly between two large plates. In a medium skillet over medium-high heat, cook the turkey bacon 3 to 4 minutes, until crisp and browned. Crumble, and sprinkle over the spinach.

In the same skillet, heat the olive oil over medium-low heat. Add the shallot and cook, stirring, 1 to 2 minutes, until softened. Add the broth, vinegar, and mustard, and cook, stirring, until the mixture forms a dressing. Immediately pour over the salad. Top with the walnuts. Season to taste with salt and pepper.