In a casserole, melt the butter and sauté the onions. Add the flour and stir. Add the milk and bring to a boil while whisking. Season with salt and pepper.
Step 3
In a baking dish, arrange the potatoes and ham. Cover with the sauce and top with parsley and Swiss cheese.
Step 4
Cook in the oven for approximately 40 minutes, or until cheese is golden and the potatoes are cooked.
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