Whisk together 2 cups of all-purpose flour, 2 teaspoons of baking powder, 1 teaspoon of baking soda, ½ teaspoon of salt, and ½ teaspoon of ground nutmeg.

Combine ½ cup of melted unsalted butter, 1 cup of granulated sugar, 2 large eggs, 1 cup of buttermilk, and 1 teaspoon of vanilla extract in a separate bowl.

Slowly pour the wet ingredients into the dry ingredients, stirring gently until just combined.

Preheat your oven to 350°F (175°C) and grease a 9x13 inch baking pan with butter or baking spray.

Pour the batter into the prepared baking pan and bake for 20 to 25 minutes.

Once baked, let the bars cool in the pan for about 10 minutes, then transfer to a wire rack.

In a large bowl, sift 1 cup of powdered sugar and add ¼ cup of pure maple syrup, 2 tablespoons of milk, and another teaspoon of vanilla extract. Whisk until smooth.

Pour the glaze over the completely cooled bars, allowing it to cascade down the sides.

Allow the glaze to set for about 30 minutes before cutting the bars into squares.