Preheat your oven to 350°F (175°C) and grease a 9x5 inch loaf pan.

In a mixing bowl, cream together the softened unsalted butter, canola oil, and sugar for 2-3 minutes until light and fluffy.

Beat in the eggs one at a time and then mix in the vanilla extract until well combined.

In a separate bowl, whisk together the flour, baking powder, and salt. Gradually add this to the wet mixture, alternating with buttermilk.

Combine a portion of the batter with molasses and cinnamon in another bowl, and mix until fully blended.

Layer half of the plain batter, followed by half of the molasses mixture into the greased loaf pan. Repeat this with the remaining batters.

Gently swirl through the layers in the loaf pan to create a marbled effect.

Bake in the preheated oven for 40-45 minutes until golden brown, and a toothpick comes out clean.

Allow the bread to cool in the pan for about 10 minutes before transferring to a wire rack.

Dip the cooled loaf in melted butter and roll it in a sugar and cinnamon mixture until fully coated.