Preheat the oven to 350℉.
In a two bowls, mix together the dry ingredients in one bowl. Then, the wet ingredients in the next bowl. Combine the dry and wet ingredients. To the side, combine the ingredients for the cinnamon sugar mixture.
In a lined loaf pan, add spoon in half the batter. Then, sprinkle half the cinnamon sugar mixture over the batter and use a knife to swirl it a little.Add in remaining batter then add the remaining cinnamon sugar mixture on top of that. Give the topping a little swirl with the knife as you did with the middle. Lastly, pour the melted butter on top but do not swirl in it. This creates the crispy topping.
Place the load pan in the oven and bake for 50 minutes or until you can insert a knife or toothpick in the center and it comes out clean. Because ovens vary, start checking the bread at the 45 minute mark.
Once the center is cooked through, remove from the oven and place on a cooling rack until the bread is completely cool. Once cooled down, lift it out of the pan, slice and serve!