Preheat oven to 375 degrees. In a large saucepan, melt 4 tablespoons butter over medium heat. Stir in flour, parsley flakes, salt, thyme and pepper until smooth. Gradually add milk; bring to a boil. Cook and stir for 2 minutes. In a large bowl, combine potatoes, ham and onion; place half in a greased 2 1/2 quart baking dish. Top with half the sauce, then potato mixture and finally the remaining sauce. Cover and bake until potatoes are almost tender, 65-75 minutes. Dot with remaining 2 tablespoons butter. Bake, uncovered, until potatoes are tender, 15 to 20 minutes.

Serve with your favorite salad from the produce department, and some grilled stickies from the bakery completes a hearty, tasty meal.