Pumpkin Pie Cake Bars

First, preheat your oven to 350 degrees Fahrenheit or 175 degrees Celsius. Next, take a moment to prepare the baking vessel by greasing and dusting it with flour, resulting in a 9x13-inch pan.

While following the package instructions, set aside one cup of cake mix for later use. In a separate bowl, merge the remaining cake mix with melted butter and one egg until you achieve a uniform consistency. Press this mixture firmly into the bottom and sides of your 9x13-inch pan to create a crust.

Meanwhile, in another bowl, blend together pumpkin puree, evaporated milk, three eggs, sugar, and a pinch of cinnamon until you reach the desired texture. Pour this mixture over your crust.

In a separate bowl, combine brown sugar and the reserved 1 cup cake mix. Using your fingers or a pastry blender, work in butter until you achieve a crumbly mixture. Sprinkle this over your pumpkin filling.

Place the prepared pan in the preheated oven and bake for 50 minutes, or until you notice a satisfactory change. Once done, refrigerate the dessert to preserve its freshness.