Preheat the oven to 325℉. Grease and flour a bundt or tube pan. Our pan has a baking capacity of 12 cups. This recipe makes about 7.5 cups of batter.
In a medium bowl, whisk the cake flour, baking powder, orange jello powder, and salt for 30 seconds. Set aside.
In another bowl, add the vegetable oil, zest of two oranges, and buttermilk. Set aside.
In the bowl of your mixer, add the butter and mix at medium speed until smooth. Gradually add the sugar and mix for 3 to 5 minutes until lightened in color and fluffy.
With the mixer on medium speed, add the eggs one at a time, mixing after each until the yellow of the yolk has blended.
With the mixer on low speed, alternately add the flour mixture and the buttermilk mixture, beginning and ending with the dry ingredients. (That will be three additions of dry and two of liquid). After the last addition, add orange coloring gel if you are using any, and mix just until incorporated.
Pour or scoop the orange cake batter into the prepared bundt pan. There should be at least 1 ¼ inches from the top of the batter to the top edge of the bundt pan. (A popular rule of thumb is not to fill the pan more than ¾ full.)
Bake at 325 degrees for 50-55 minutes or until a toothpick inserted into the center comes out clean or with just a few crumbs attached. Let cool 10 minutes and turn out. Baking times may vary. (Check after 45 minutes to be safe.)