In a small bowl combine 1/3 of the sugar and cinnamon.
In a large bowl combine flour, salt, baking powder, and a cup of sugar.
In a separate bowl beat egg, milk, and vegetable oil, add to flour, and whisk until smooth.
Line a 9*5" loaf pan with parchment. Pour half the dough, sprinkle with half the cinnamon sugar. Repeat. Stick a knife into the dough and draw swirls.
Bake for 45 minutes in an oven preheated to 350F. Then check if it's baked by poking it through the center with a bamboo skewer. Cool on a wire rack, wrap in foil, and set overnight before slicing