Bake: Preheat your oven and prepare the white cake mix according to the box instructions. Pour into a greased 11x7-inch (or 9x13 for a thinner cake) baking pan. Bake until a toothpick comes out clean.
Poke: While the cake is still warm, use the end of a wooden spoon to poke holes across the entire surface at ½-inch intervals.
The Pineapple Soak: In a medium saucepan, combine the crushed pineapple (with its juice) and 1 cup of sugar. Bring to a boil over medium heat, stirring until the sugar dissolves.
Drench: Pour the hot pineapple mixture evenly over the warm cake, ensuring the juice seeps into the holes. Set aside to cool completely.
Cream Cheese Frosting: In a large bowl, beat the softened cream cheese, butter, and powdered sugar with an electric mixer until light and fluffy.
Fold: Use a spatula to fold in the vanilla extract and the crushed pecans.
Finish: Spread the thick pecan frosting over the cooled cake using an offset spatula.
Chill: For the best flavor, let the cake sit in the fridge for at least 30 minutes before slicing to allow the pineapple soak to set.