How to Make It
Heat a large skillet. Add the bacon and cook over high heat until crisp, about 4 minutes; transfer to a plate. Season the chicken tenders with salt and pepper, add to the skillet and turn to coat with bacon fat. Cook, turning once or twice, until the tenders are brown on the outside and white throughout, about 5 minutes. Add to the bacon.
Add the tomatoes, scallions and vinegar to the skillet and boil for 1 1/2 minutes. Return the chicken and bacon to the pan, stir well and season with salt and pepper. Arrange the watercress on 4 plates, top with the chicken salad and serve.