Preheat the oven to 350° F and spray a 9x13 baking dish with non-stick cooking spray.

In the bowl or a standing mixer, combine the eggs, cake mix, pumpkin purée, oil, sour cream or yogurt and pumpkin pie spice. Mix for 1 to 2 minutes or until well combined.

Pour half of the cake batter into the prepared baking dish.

Sprinkle the top of the batter with the chopped walnuts followed by the brown sugar. Be sure to keep the layer even.

Pour the rest of the batter over the top of the walnut and brown sugar layer.

Bake for 35 to 40 minutes or until a toothpick inserted in the center comes out clean.

Remove the cake from the oven and let cool for about 20 minutes.

While the cake cools, stir together the powdered sugar and milk in a small mixing bowl to make the glaze.

Once the cake is cool enoug that the glaze won't melt and disappear, drizzle the top of the cake with the glaze.

Slice and enjoy!