Prepare a 10-cup bundt pan by spraying it with non-stick cooking spray really well, getting into all the nooks and crannies (I prefer the kind that has flour in it). Set aside.
Add the 15.25 ounce box yellow cake mix, 1 cup all-purpose flour, 3.4 ounce box instant vanilla pudding, 1 cup granulated white sugar, 1 cup melted butter, 1 cup buttermilk, ½ cup sour cream, 4 large eggs, room temperature and 1 Tablespoon vanilla bean paste to a large bowl and whisk until thoroughly combined and smooth. Set aside.
Add the 1 cup dark brown sugar, packed, 2 Tablespoons ground cinnamon and the remaining ½ cup of melted butter to a medium bowl. Stir until combined.
Add approximately half of the cake batter to the bundt pan.
Add approximately half of the cinnamon filling and use a knife to gently swirl the filling into the batter.
Add the remaining batter over the top, followed by the remaining cinnamon filling. Gently swirl the filling into the batter again.
Bake on the middle rack for approximately one hour or until a toothpick inserted into the cake comes out with just a few moist crumbs.NOTE: Oven times can vary. Please go by cake doneness, not just by time.
Remove the cake from the oven and allow it to cool for 15-20 minutes before flipping it onto a cake plate. Then allow it to cool completely before frosting.
To create the cream cheese frosting, add the 8 ounce block cream cheese, softened to room temperature, 1 teaspoon vanilla bean paste and 2 cups powdered sugar to a mixing bowl. Mix on low/medium until combined.
Add the ¼ cup heavy whipping cream and mix again until combined and smooth.NOTE: If you would like the frosting thinner, add more heavy cream. If you want it thicker, add more powdered sugar.
Drizzle the frosting over the cake. Slice and serve!
Notes
Please refer to my FAQ’s (Frequently Asked Questions) and ingredient list above for other substitutions or for the answers to the most common questions.
If your cream cheese is not fully softened to room temperature, it will be lumpy.