Preheat your oven to 350°F (175°C). Grease and flour a 9x5 inch loaf pan, or line it with parchment paper.
In a small bowl, whisk together the ingredients for the cinnamon sugar topping: 0.125 cup granulated sugar and 1 tablespoon ground cinnamon. Set aside.
In a medium bowl, whisk together the flour, baking soda, salt, and 1 teaspoon ground cinnamon.
In a large bowl, cream together the softened butter and 1 cup granulated sugar until light and fluffy.
Beat in the eggs one at a time, then stir in the milk and vanilla extract.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Do not overmix.
Pour half of the batter into the prepared loaf pan. Sprinkle about half of the cinnamon sugar mixture over the batter.
Pour the remaining batter over the cinnamon sugar layer. Sprinkle the rest of the cinnamon sugar mixture evenly over the top.
Bake for 50-60 minutes, or until a wooden skewer inserted into the center comes out clean.
Let the bread cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.
Notes
This bread is delicious served warm or at room temperature. It pairs wonderfully with coffee or tea.