• Begin by preheating the oven to a temperature of 350 degrees Fahrenheit.
• Thoroughly spray a 10-inch bundt pan with a non-stick cooking spray. Once prepared, set it aside.

Preparing the Pecan Topping:

• In a medium-sized bowl, combine the melted butter, brown sugar, corn syrup, and salt. Utilize a hand-held mixer or whisk to ensure that the brown sugar is almost fully dissolved.
• Introduce the chopped pecans to the brown sugar mixture and stir until the ingredients are uniformly combined.
• Transfer this mixture into the prepared bundt pan. Utilize a spatula to ensure the mixture is evenly spread out.

Preparing the Cake Batter:

• In a larger bowl, combine the vanilla cake mix, eggs, vegetable oil, water, and sour cream. Mix these ingredients thoroughly, ensuring no lumps persist.
• Carefully pour the cake batter over the pecan topping, making certain it covers the topping entirely.
• Place the bundt pan in the preheated oven and bake for a duration of 40-45 minutes. The cake is deemed ready when an inserted toothpick or cake tester emerges clean.
• Once baked, remove the bundt pan from the oven and place it on a cooling rack. Allow it to cool for a duration of 10 minutes. Please refrain from inverting the pan during this period.
• After the stipulated cooling time, position a large plate over the bundt pan and invert the cake onto the plate. It may be beneficial to gently tap the top of the pan to ensure the cake releases seamlessly.
• The cake can be sliced and served either warm or at room temperature, as per preference.