Preheat the Oven: Set the oven to 350°F (175°C) to ensure it’s hot when the cake is ready to bake.
Prepare the Baking Dish: Grease a 9x13-inch baking dish with butter or cooking spray to prevent sticking.
Add the Cake Mix: Evenly spread the yellow cake mix over the bottom of the baking dish.
Layer the Sugar and Pecans: Sprinkle the brown sugar over the cake mix, followed by a layer of chopped pecans.
Add the Butter: Pour the melted butter evenly over the top of the mixture.
Bake: Place the dish in the oven and bake for 40-45 minutes or until the top is golden and the filling is bubbly.
Cool & Serve: Allow the cake to cool for a few minutes before serving. Optionally, serve with vanilla ice cream or whipped cream for extra indulgence.