Step 1: Prepare the Cake

Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish with non-stick spray or butter. Prepare the butter pecan cake mix according to the package instructions, adding the vanilla extract for enhanced flavor. Pour the batter into the prepared baking dish and bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.

Step 2: Prepare the Praline Filling

While the cake bakes, combine the sweetened condensed milk and caramel sauce in a small saucepan over medium heat. Stir until well blended and heated through, about 2-3 minutes. Remove from heat and stir in the chopped pecans.

Step 3: Poke the Cake

Once the cake has finished baking, remove it from the oven and let it cool for 10-15 minutes. Using the handle of a wooden spoon or a skewer, poke holes evenly across the surface of the cake, spacing them about 1 inch apart. Pour the warm praline filling over the cake, ensuring the sauce fills the holes. Spread it evenly with a spatula if needed. Let the cake cool completely.

Step 4: Make the Whipped Topping

In a large mixing bowl, beat the heavy whipping cream with an electric mixer on medium speed until soft peaks form. Add the powdered sugar and vanilla extract, then continue beating until stiff peaks form. Cover and refrigerate until ready to use.

Step 5: Prepare the Butter Pecan Topping

In a skillet over medium heat, melt the butter. Add the chopped pecans and brown sugar, stirring constantly until the pecans are toasted and coated in the caramelized sugar, about 3-4 minutes. Remove from heat and let cool completely.

Step 6: Assemble the Cake

Spread the whipped topping evenly over the cooled cake. Sprinkle the butter pecan topping generously over the whipped cream layer. Drizzle with caramel sauce and add any additional garnishes, such as whole pecans or white chocolate shavings, for an elegant finish.

Step 7: Chill and Serve

Refrigerate the assembled cake for at least 2 hours before serving to allow the flavors to meld. Slice into squares and serve chilled.