01 - Preheat oven to 350°F. Generously grease and flour a 9x5-inch loaf pan or line with parchment paper for easy removal.
02 - In a large mixing bowl, whisk together flour, sugar, baking powder, baking soda, cinnamon, and salt until thoroughly combined.
03 - In a separate bowl, whisk milk, eggs, melted butter, oil, and vanilla extract until smooth and fully incorporated.
04 - Pour wet ingredients into dry ingredients. Fold gently with a spatula until just combined—some small lumps are acceptable. Avoid overmixing to prevent tough texture.
05 - Transfer batter to prepared pan, smoothing the top with an offset spatula. Bake for 45-55 minutes until a wooden skewer inserted into the center emerges clean.
06 - Allow bread to rest in pan for 10 minutes to set structure. Carefully remove from pan and transfer to a wire cooling rack.
07 - While bread is still warm, brush top with melted butter. Combine sugar and cinnamon in a small bowl, then sprinkle evenly over buttered surface.
08 - Cool completely before slicing for clean cuts, or serve slightly warm for maximum donut-like experience with the cinnamon sugar crust.