Preheat the oven to 350°F. Grease two 9x5 inch loaf pans with 2 tablespoons vegetable shortening. Set aside.
Fill a small saucepan halfway with water and bring to a boil. Add the 1 cup unsalted shelled pistachios, boiling for 3-4 minutes. Drain and place on a tea towel, rolling around to get the papery skins off.*
In a large bowl or the bowl of a stand mixer fitted with the paddle attachment, blend together the 15.25 ounces boxed yellow cake mix, 2 (3.4) ounces boxed pistachio pudding mix , 4 eggs , 1/2 cup vegetable oil, 1 cup plain Greek yogurt and 2 teaspoons vanilla extract until it is thick, like a banana bread batter.
Fold in 3/4 cup of the coarsely chopped pistachios.
Transfer the batter evenly to the prepared loaf pans, evening out the top.
Bake for 45 minutes or until they pass the toothpick test.
Allow to cool fully before popping out of the pan and placing on a wire cooling rack.
Pistachio Glaze:
In a medium mixing bowl, whisk together the melted 2 tablespoons unsalted butter2 cups powdered sugar, 1 tablespoon milk, 1 teaspoons vanilla extract and 1/8 fine sea salt.
Allow to sit for 2-3 minutes before drizzling over the loaf cakes.
Sprinkle with the remaining chopped pistachios while the glaze is still tacky.
If you've tried this recipe, come back and let us know how it was in the comments or star ratings.
Notes
The step of boiling and peeling pistachios will not alter the flavor of the bread, but the skins can cause the bread to have little flecks of brown. This process, however, is a little time consuming and tedious. Plan for at least 15 minutes to do the whole cup.