Preheat oven to 400°F. Generously spray 9-inch pie plate with cooking spray.
Place potatoes in medium microwave-safe bowl. Cover with plastic wrap; microwave on 50% power 5 minutes or until thawed. Add Parkay and onion powder to potatoes; stir to combine. Spoon mixture into pie plate. Place mixed vegetables in same bowl. Cover with plastic wrap; microwave on 50% power 3 minutes or until thawed; drain.
Meanwhile, press potato mixture over bottom and up sides of pie plate. Spoon ham, vegetables and cheese evenly over potatoes. Pour Egg Beaters over top of all.
Bake on lower oven rack 25 minutes or until potatoes start to brown on outside and knife inserted in center comes out clean. Let stand 2 minutes before cutting into 4 wedges.
Use your favorite vegetable in this potato crust tart. Just be sure to cut any large pieces into small pieces.