Warm your peanut butter for 15-20 seconds in the microwave before swirling into the batter to ensure smooth, even distribution without streaky patches.

Reserve half your Butterfinger pieces for the final frosting layer—this keeps them crispy and fresh rather than soggy from absorbing moisture while baking.

Fold in whipped topping when it's slightly thawed but still cold, and work quickly to maintain its airy texture and prevent deflation in your frosting.

Drizzle chocolate syrup in a crosshatch pattern between cake layers rather than pooling it in one spot to ensure every bite has chocolate flavor throughout.

Substitute milk for water in the cake mix and add an extra egg to create a richer, more moist crumb that holds up better with peanut butter and wet frosting layers.