Preparation:
Stir together flour, sugar, salt and baking powder; make well in center. Combine egg, milk, and oil; add all at once to dry mixture. Stir just till moistened. Fold blueberries and lemon peel into batter. Fill will-greased muffin pans or paper bake cup lined muffin pans 2/3 full. Bake at 400° for 20 to 25 minutes. While muffins are warm, dip tops in melted butter and then in sugar.
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