Scalloped Potatoes and Ham

As everyone knows Matt is very picky with what he eats, he doesn't care for casseroles, but he liked this one quite a bit and even ate the left overs which is rare.

3-4 large potatoes cut into 1/4 in. thick slices
16 oz sour cream
12 oz Velveeta cheese
1pkg (8oz) ham chopped ( I used 2 ham steaks and it worked good)
1/4 C. Parmesan cheese

Preheat oven to 350
Place potatoes in large saucepan cover with water bring to boil, reduce heat and let simmer 10-12 min until tender.
Drain potatoes and transfer 1/4 of the potatoes to bowl add sour cream and mash and cheese and ham mix lightly.
Spray 13x9in. dish with cooking spray. Add mixture and the remaining sliced potatoes to cooking dish.
Sprinkle with Parmesan cheese
Bake 30 min or until heated through.