Preheat your oven to 325°F.
Whisk together the flour, baking soda, and salt in a medium mixing bowl and set it aside.
Place the butter in the bowl of a stand mixer fitted with the paddle attachment and beat on medium-high (a setting of 7-8) for 3 to 4 minutes until light and creamy. Add the sugar and continue to beat on medium-high for 3 to 4 more minutes until pale and fluffy.
Add the eggs, one at a time, beating on medium after each addition until completely mixed in. Scrape down the bowl to ensure everything gets fully mixed.
Add ⅓ of the flour mixture and beat until no more dry flour is visible. Start on low speed and gradually increase to medium. Add ½ of the sour cream and beat on medium until mixed in. Scrape down the bowl and repeat the process with the remaining flour and sour cream, being sure to end with the flour. Beat in the vanilla bean paste.
In a small mixing bowl, mix the pecans, brown sugar, and cinnamon with a fork.
Spray a bundt pan generously with baking spray, using a pastry brush to coat every crevice.
Pour half of the cake batter into the bundt pan and smooth it out into an even layer. Sprinkle the pecan mixture over the entire layer of cake batter and pour the remaining cake batter over top, smoothing it into an even layer.
Bake the cake in the preheated oven for 55-70 minutes, or until a toothpick or skewer inserted into the center comes out clean aside from a few moist crumbs.
Transfer the pan to a wire rack and allow the cake to cool completely in the bundt pan. Once the cake has completely cooled, carefully flip it out onto a plate or cake stand.
In a medium mixing bowl, whisk together the powdered sugar, 3 tablespoons of milk, cinnamon, and vanilla extract until smooth. If the glaze is too thick add up to one additional tablespoon of milk until the glaze reaches a thick, pourable consistency.
Pour or spoon the glaze on top of the cake, allowing it to run down the center and sides. Slice and enjoy!