1. In a small saucepan of boiling salted water, cook potato until tender, 10-12 minutes. Alternatively, cook potato in microwave until tender. Let cool for 5 minutes. Slice thinly and overlap in a greased small shallow gratin (casserole) dish. 2. In a small saucepan, heat butter over medium heat; cook onion and garlic until softened, about 3 minutes. Stir in the flour; cook for 1 minute. Whisking constantly, add milk, 1/2 cup at a time. Whisk in cayenne pepper, mustard, salt, pepper and nutmeg to taste. Reduce heat to low; simmer, whisking occasionally, until thickened, 5-7 minutes. Stir in Gruyere and Parmesan cheeses. 3. Pour 1/2 cup of sauce over potato. Top with Swiss chard, pressing to compact. Pour remaining sauce over top. Bake in a 400 F oven for 20-25 minutes or until bubbly and browned. ---------------------------------------------------------------------------
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