Instructions:
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Preheat oven to 350°F (175°C). Grease a 9×5-inch loaf pan and line with parchment paper.
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In a bowl, whisk together melted butter, oil, sugar, eggs, buttermilk, and vanilla until smooth.
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In another bowl, mix flour, baking powder, baking soda, and salt.
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Gradually mix the dry ingredients into the wet mixture until just combined.
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In a small bowl, combine brown sugar and cinnamon for the swirl.
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Pour half of the batter into the loaf pan, sprinkle half the cinnamon swirl, then repeat with remaining batter and swirl. Gently swirl with a knife for a marbled effect.
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Bake for 50–60 minutes, or until a toothpick comes out clean. Let cool in pan 10 mins, then transfer to a wire rack.
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Brush warm bread with melted butter, then sprinkle with the cinnamon sugar topping.
