Preheat oven to 350℉. Grease and flour a 10-cup bundt pan, and set it aside.
To a large bowl, add flour, baking powder, baking soda, sugar, and salt. Whisk well to combine.
In mixing bowl add shortening, milk, eggs, vanilla and mashed bananas. Mix for 2 minutes at low speed.
Slowly add in flour mixture until combined.
Pour cake batter into the prepared greased bundt pan.
Bake in preheated oven for 40 minutes, or until a toothpick inserted into the cake comes out dry, or with a few moist crumbs.
Notes
Have all ingredients at room temperature. Having everything at room temp makes it easier to combine the wet and dry ingredients without over mixing.
A quick way to bring eggs to room temperature is to place them in a dish or bowl covered with warm water (should be warm to the touch, but not hot or boiling) for about 5 minutes.
Be sure to grease and flour the pan well! It's best to use non-stick cooking spray or brush it with melted butter. Be sure to get into all the creases of your bundt pan to prevent the cake from sticking.