In a large mixing bowl, combine canola oil, softened butter, and granulated sugar. Use a hand mixer to cream until light and fluffy, about 2-3 minutes. Add eggs and vanilla extract, beating until smooth.

In a separate bowl, whisk together all-purpose flour, baking powder, salt, and ground cinnamon. Combine thoroughly to ensure even distribution.

Gradually add the dry ingredients to the wet mixture, alternating with buttermilk. Mix gently until just combined.

Grease a 9x5-inch loaf pan. Pour half of the batter into the pan. Mix molasses with a cinnamon sugar mixture and drizzle over the batter. Top with remaining batter.

Preheat oven to 350°F (175°C). Bake for 45-50 minutes until a toothpick comes out clean.

Cool the bread in the pan for about 10 minutes, then transfer to a wire rack. Brush with melted butter and coat with brown sugar and ground cinnamon mixture.