Arrange wings in shallow baking pan. Heat butter, soy sauce, sugar, water, mustard and garlic powder if using, until butter and sugar melt. Cool; pour over wings and marinate at least 2 hours, turning once or twice. Bake in same pan at 375 degrees for 1 1/4 to 1 1/2 hours, turning occasionally. (Use the plumpest chicken wings you can find; if your market only has the normal scrawny ones, don't cook longer than 75 minutes) Drain on paper towels and serve.
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