Preheat your oven to 350°F (175°C). Grease a 9x5 inch loaf pan or line it with parchment paper.
In a large bowl, whisk together melted butter and sugar. Add the egg, buttermilk, and vanilla, and stir until smooth.
In another bowl, combine flour, baking powder, baking soda, salt, nutmeg, and cinnamon.
Gradually add the dry ingredients into the wet, stirring just until combined. Don’t overmix—nobody likes a tough loaf.
Pour the batter into your prepared loaf pan. Bake for about 45-50 minutes or until a toothpick inserted in the center comes out clean.
Let the loaf cool in the pan for about 10 minutes, then transfer to a wire rack.
While still warm, brush the top with melted butter. Combine cinnamon and sugar, then sprinkle (or dunk generously) over the top.
Slice. Eat. Repeat.