Preheat oven to 350°. Grease loaf pan. Combine flour, sugar, baking powder, baking soda, and salt. Whisk together milk, eggs, oil, and orange peel. Add milk mixture to dry mixture stirring just until combined. Stir in nuts. Pour into pan and bake 55-60 min. Cool in pan 20 min. Combine frosting ingred. and spread in bread.
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