Preheat oven to 350°F (175°C). Grease a 9x5-inch loaf pan generously.

In a medium bowl, whisk together flour, baking powder, baking soda, salt, cinnamon, and nutmeg.

In a large bowl, cream softened butter, brown sugar, and granulated sugar until light and fluffy. Beat in eggs one at a time, then stir in vanilla.

In a small cup, whisk together the apple cider and yogurt/sour cream.

Add the flour mixture and cider mixture to the butter mixture alternately, starting and ending with flour. Mix until just combined.

Pour batter into the prepared pan and bake for 50-60 minutes, or until a toothpick comes out clean.

Let cool in pan for 10 minutes, then transfer to a wire rack.

While warm, brush the top with melted butter. Mix topping sugar and cinnamon, then sprinkle heavily over the loaf.