Prepare the Cake:
Preheat oven to 350°F (175°C). Grease a 9×13-inch pan.
Mix cake batter according to package instructions, adding vanilla for extra flavor.
Pour into pan and bake 25–30 minutes, until a toothpick comes out clean.
Cool for 10–15 minutes.
Make the Butter-Pecan Sauce:
In a saucepan, melt butter over medium heat. Add brown sugar and whisk until smooth.
Slowly pour in heavy cream while whisking — the mixture will bubble.
Simmer for 2–3 minutes until slightly thickened, then stir in vanilla and pecans.
Let cool slightly (it should still be pourable).
Poke & Soak:
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