Preheat your oven to 350°F. Grease a 9x5-inch loaf pan.
In a large bowl, whisk together the flour, sugar, baking powder, and salt.
In another bowl, combine the milk, eggs, melted butter, and vanilla. Mix well.
Pour the wet ingredients into the dry and stir until just combined. Don’t overmix—lumpy is lovely.
Pour the batter into the prepared loaf pan and bake for 45–50 minutes, or until a toothpick comes out clean.
Let the loaf cool slightly, then brush the top with melted butter.
Mix cinnamon and sugar in a small bowl and sprinkle over the warm loaf.
Slice, serve, and try not to eat the whole thing in one sitting.