In a bowl, whisk together corn syrup, half of the melted butter, milk, eggs, brown sugar, cream, vanilla, spice, and salt until smooth and glossy

Stir in half of the pecans and mix until they are fully coated in the rich filling

Pour the mixture into the baking dish and spread it into an even layer

Sprinkle the dry cake mix evenly over the top without mixing, creating a uniform layer

Scatter the remaining pecans across the surface for added crunch

Drizzle the rest of the melted butter over the dry mix, making sure most of it is lightly moistened

Cover the dish with foil and bake until the center is set but still slightly soft and bubbling

Remove the foil and allow the top to lightly brown while finishing in the oven

Let the cake cool slightly until it thickens and becomes scoopable with a soft, gooey texture