❶ Preheat the OvenPreheat your oven to 350°F (175°C).Grease a 9x13-inch baking dish.❷ Prepare the Pumpkin MixtureIn a large bowl, whisk together:Pumpkin pureeEvaporated milkEggsSugarWhisk until smooth.❸ Assemble the CakePour the pumpkin mixture into the prepared baking dish.Sprinkle the dry cake mix evenly over the pumpkin mixture.If using pecans, sprinkle them over the cake mix.Drizzle the melted butter evenly over the top.❹ BakeBake for about 50 minutes, or until the top is golden brown and a toothpick inserted into the center comes out clean.Allow the cake to cool completely before serving.❺ ServeOptionally, top with whipped cream or a scoop of vanilla ice cream.