Preheat your oven to 350°F. Grease a 9×5-inch loaf pan (or 2 8×4 pans for smaller loaves). Sprinkle the bottom with cinnamon sugar if desired and set aside.

In a large bowl, combine the cake mix, pudding mix (dry), eggs, water, oil, nuts, extract and sour cream. If you want it a brighter green, add in a few drops of food coloring.

Pour the batter into the prepared loaf pan.

Bake for 50-60 minutes, or until a toothpick comes out clean. Baking times may vary, so start checking for doneness around 50 minutes and adjust accordingly. If it’s browning too fast, place a piece of foil over the top.

Allow the bread to cool in the pan for about 10 minutes, then remove it from the pan and transfer it to a wire rack to cool completely.

For the glaze, whisk together the powdered sugar, heavy cream, butter and vanilla in a small bowl. Add more milk if needed to thin.

Once the cake has cooled, drizzle the glaze over top. Then sprinkle pistachios over top. Slice it into 12 servings and enjoy!