Preheat oven to 350°F.

Sprinkle pork with salt and pepper; spray with nonstick cooking spray.

In a large nonstick skillet, heat oil over medium-heat.

Add pork; cook 5 minutes or until browned, turning occasionally.

Bake for 15 minutes; brush with 1/4 cup dressing.

Bake an additional 5 minutes or until meat thermometer registers 155°F.

Let stand 10 minutes; cut into thin slices.

In a large bowl, combine spinach, apple, greens, peas and remaining dressing; toss.

Top with pork.