Preheat oven to 325F degrees. Spray 10-inch bundt pan with nonstick cooking spray (that has flour in it) or grease and flour bundt pan.
In a medium bowl, combine 1 box yellow cake mix, 4 ounce small box instant lemon pudding, 3/4 cup 7-Up soda, 4 large eggs and 3/4 cup vegetable oil.
Mix until thoroughly combined.
Pour batter into prepared bundt pan.
Bake for about 35-45 minutes (until inserted toothpick or fork comes out clean). Allow to cool completely, then remove from bundt pan and place on a cake plate.
Start preparing icing. In a small bowl, combine 2 cups powdered sugar, 1 Tablespoon fresh lemon juice and lemon zest from one lemon. Add 1-2 Tablespoons milk in slowly until you've reached desired consistency. I personally like it a bit on the thicker side.
Then slowly pour it over the cooled cake.
Allow it to sit for a bit to set up (it won't harden up fully like a frosting) then slice and serve.
Video
Notes
Please refer to my FAQ’s and ingredient list above for other substitutions or for the answers to the most common questions.