1. Place spinach in a 2 1/2-quart glass casserole, covering the bottom of the dish evenly. Top with turkey and season with salt and pepper. Blend remaining ingredients until smooth in a small bowl. Pour mixture evenly over turkey, smoothing with a spatula, if necessary.
2. Cover and microwave at Cook Cycle 1 (power level 10) for 10 to 13 minutes, or until heated through. Let stand, covered, 5 minutes before serving.