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, granulated sugar, baking powder, baking soda, cinnamon, and salt until evenly distributed.
03 - In a separate bowl, whisk together milk, eggs, melted butter, vegetable oil, and vanilla extract until completely smooth and emulsified.
04 - Pour wet ingredients into dry ingredients. Fold gently with a spatula just until flour disappears—small lumps are acceptable. Avoid overmixing to prevent tough texture.
05 - Pour batter into prepared loaf pan. Use spatula to spread evenly and smooth the top surface.
06 - Bake for 45-55 minutes until golden brown and a toothpick inserted in center emerges clean or with moist crumbs.
07 - Let bread rest in pan for 10 minutes to set. Carefully remove from pan and transfer to wire rack.
08 - Brush warm loaf generously with melted butter. Mix cinnamon and sugar in small bowl, then sprinkle evenly over buttered surface while bread is still warm.
09 - Allow bread to cool completely for clean slices, or serve slightly warm for maximum donut-like experience.