Preheat your oven to 350°F (175°C) and prepare an 8-inch square baking pan.

In a medium-sized mixing bowl, whisk together the flour, baking soda, baking powder, salt, and nutmeg.

Cream the butter and sugar together using an electric mixer until light and fluffy.

Add the egg, vanilla extract, and buttermilk to the creamed mixture and mix well.

Gradually combine the dry mixture with the wet ingredients, stirring gently.

Pour the batter into the prepared pan and smooth the top.

Bake for 18-20 minutes until a toothpick inserted comes out clean.

Let the bars cool on a wire rack for 10 minutes before removing from the pan.

Prepare the glaze by whisking together powdered sugar, maple syrup, maple extract, and milk.

Once cooled, drizzle the glaze over the bars and let it set before slicing.