Scalloped Potatoes and Ham

2 cups cooked ham, cubed
8 medium potatoes, peeled and thinly sliced
1/4 cup onion, finely chopped
1/2 cup all purpose flour
2 cups milk
3 tablespoons dry bread crumbs
1 tablespoon unsalted butter, melted
2 tablespoons parsley, finely chopped

Preheat oven to 350F. Place half the ham in a buttered casserole dish. Cover with half the potatoes and half the onion. Season with salt and pepper to taste. Sift half the flour over. Repeat layering ham, potatoes and onion, seasoning with salt and pepper to taste. Sift remaining flour on top. Pour milk over all. Cover tightly and bake 1 to 1 1/4 hours. Remove cover. Sprinkle bread crumbs over potatoes. Drizzle with melted butter. Sprinkle with parsley and bake another 15 minutes.