
Preheat the oven to 325 degrees Fahrenheit. Prepare a 12-cup bundt pan by using a paper towel to coat the inside well with shortening. Dust the inside of the pan well with flour before gently tapping the excess.
Sift 3 cups all-purpose flour, ½ teaspoon baking soda, and 1 teaspoon salt together in a medium bowl and set aside.
Add 1 cup softened unsalted butter and 3 cups granulated sugar to the bowl of a stand mixer and beat on medium-high speed with the paddle attachment until light and fluffy, about 4 minutes. Add 6 large eggs, one egg at a time, beating well after each addition.
On low speed, add in the flour mixture and 1 cup sour cream in a few additions, alternating between the two until completely absorbed . Add 1 tablespoon vanilla extract and mix until just barely combined.
Pour the batter into the prepared bundt pan and bake for about 80 to 85 minutes, or until a toothpick comes out nearly completely clean, with minimal crumbs on it.
Let the cake cool for about 20 minutes before inverting the cake onto a cooling rack. Wait 5-8 minutes before trying to lift the pan up off the cake. Allow to cool completely before slicing.
Dust with powdered sugar and the toppings of your choice, and enjoy.