01 - Preheat oven to 350°F. Grease and flour a 9x5-inch loaf pan or line with parchment paper.
02 - Whisk together flour, sugar, baking powder, baking soda, cinnamon, and salt in a large bowl.
03 - Whisk milk, eggs, melted butter, oil, and vanilla extract in a separate bowl until smooth.
04 - Pour wet ingredients into dry ingredients. Stir gently until just combined—do not overmix.
05 - Transfer batter to prepared loaf pan and smooth top evenly.
06 - Bake 45-55 minutes until toothpick inserted in center comes out clean.
07 - Let bread cool in pan 10 minutes, then remove to wire rack.
08 - Brush warm bread top with melted butter. Mix sugar and cinnamon in small bowl, then sprinkle evenly over surface.
09 - Cool completely for clean slices, or serve slightly warm for fresh donut experience.