Grease a large tube pan (or bundt pan) with a thin layer of softened butter. Dust with flour and set aside.
Beat butter, cream cheese, and sugar in the bowl of a stand mixer fitted with the paddle attachment on medium speed for 2 minutes. Stop the mixer and scrape down the sides of the bowl.
Turn the mixer to low speed and beat in eggs, one at a time, allowing each to fully incorporate before adding the next. Once the last egg is mixed in, stop the mixer and scrape down the sides of the bowl.
Beat in salt. Add flour, 1 cup at a time, mixing on low speed for 15 seconds between each addition. Beat in vanilla bean paste until fully incorporated.
Spoon batter into prepared pan, using an offset spatula or knife to spread into an even layer. Place the pan in a cold oven on the center rack, and set the temperature to 275°. Bake for 2 hours.
Do not open the oven before 2 hours has gone by. Once you get to that point, you can open the oven and insert a knife or a cake tester into he center of the cake. If it comes out clean with only a few large crumbs, the cake is done.
Allow cake to cool completely in the pan before turning out onto a rack. Serve warm or at room temperature with whipped cream and fresh berries.