Preheat the oven to 325° Fahrenheit. Spray a 12 cup bundt cake pan with cooking spray (or grease with shortening, then dust with flour). Set aside.
Add the cake mix, pudding mix, eggs, orange juice and oil to a large mixing bowl and mix with an electric mixer on medium speed until well combined, scraping the sides of the bowl as needed (about 2 minutes). Fold in the chopped pistachios.
1 box white cake mix, 1 package pistachio instant pudding mix, 4 large eggs, 1 cup orange juice, 1 cup canola oil, ½ cup chopped pistachios
Pour the batter into the prepared bundt pan. Bake for 55-60 minutes. To check if it is fully cooked, insert a toothpick to the center and it should come out clean.
Let the cake cool for 15 minutes and then flip onto a wire rack to let it cool completely.
For the glaze, add the melted butter, powdered sugar, milk and extract into a bowl. Whisk well until smooth. Add more milk a teaspoon at a time until it is at the consistency you'd like.
Once the cake has cooled, drizzle with glaze and sprinkle with chopped pistachios. Store in an airtight container at room temperature.
⅓ cup chopped pistachios
Notes
*If you have problems with the cake falling, choose a cake mix without pudding already in the mix. The calories shown are based on the cake being cut into 15 pieces, with 1 serving being 1 slice of cake. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information. The information in the nutrition box are calculated through a program and there is room for error. If you need an accurate count, I recommend running the ingredients through your favorite nutrition calculator.**