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Preheat oven to 350° and grease and flour a 9x5x3" loaf pan.
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Mix 1/3 cup sugar and cinnamon together and set aside.
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Combine flour, baking powder, salt and remaining 1 cup sugar in a large bowl.
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Combine egg, milk and oil and add to flour mixture.
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Stir by hand just until moistened.
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Pour half the batter into prepared loaf pan.
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Sprinkle with half the cinnamon sugar mixture.
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Repeat with remaining batter and cinnamon mixture, then draw a knife through batter to marble.
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Bake for 45 to 50 minutes or until a toothpick inserted in center comes out clean.
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Cool in pan for 10 minutes, then remove and cool on a wire rack.
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Wrap and store bread overnight before slicing.