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

Combine ¼ cup softened unsalted butter, ¼ cup oil, and 1 cup sugar in a mixing bowl and beat until smooth.

Add 2 large eggs and 1 tsp vanilla extract to the mixture, then mix until smooth.

In another bowl, whisk together 1½ cups flour, 1 tsp baking powder, ½ tsp salt, and ½ tsp cinnamon. Gradually add to the wet ingredients alternating with ½ cup buttermilk.

In a small bowl, mix a portion of the batter with ½ tsp molasses and a pinch of cinnamon.

Layer half of the plain batter in the loaf pan, add the molasses mixture, then cover with the remaining plain batter.

Swirl the top layer gently with a knife to create a marbled effect.

Bake for 40-45 minutes until a toothpick comes out clean.

Let cool in the pan for 10 minutes before transferring to a wire rack.

Dip the top of the loaf in ½ cup melted butter and sprinkle with the topping mixture.