1/3 cup brown sugar
1 1/2 teaspoons cinnamon
2 cups all-purpose flour
1 cup sugar
1/2 cup brown sugar
1 teaspoon baking soda
3/4 teaspoon salt
2 eggs
1/2 cup oil
1 cup buttermilk
1/4 cup water
1 teaspoon vanilla
2 Tablespoons butter, melted
Recipe
Preheat your oven to 350°. 
In a small bowl, mix together the 1/3 cup of brown sugar and the 1 1/2 teaspoons of cinnamon. Set aside.
In a mixing bowl, whisk together the flour, sugar, 1/2 cup brown sugar,  baking soda, and salt. Add the eggs, oil, buttermilk, water, and vanilla. Beat just until combined.
Using a greased 9“ x 5“ loaf pan with parchment paper in the bottom, pour in half of your bread batter. Sprinkle with half of your brown sugar & cinnamon mixture. Top with the remaining bread batter. Sprinkle the remaining brown sugar and cinnamon mixture on top. Lightly swirl the brown sugar and cinnamon mixture into your bread batter. 
Drizzle the top of your bread with the melted butter.
Bake at 350° for 50 to 60 minutes or until the bread is just done in the center.  Allow to cool before slicing.